Mafic’s new Shelby NC location is set to be the largest Basalt Fiber Production Facility in the World But Felsic is rich in silica and aluminium. See more. The location has high levels of silica along with water and burnt earth (due to the magma), thus making the lava sticky. Mafic is rich in heavy minerals like magnesium and ferric, or iron. 3. It is an extremely vesicular basaltic lava with very small ( 1mm) vesicles. The difference in the level of silica present in the two arises from the origin of the two rocks. On the other hand, Felsic has much higher levels of silica. Hence, rhyolite and basalt as fine-grained volcanic rocks are porphyritic and granite, syenite, etc. Though obsidian is usually dark in color similar to mafic rocks such as basalt, obsidian's composition is extremely felsic. Mafic rocks derive from basalt … Mafic rocks include basalt, its intrusive equivalent of gabbro, and a variety of less common rock types with higher or lower contents of Na and K. Andesite and its intrusive equivalent, diorite, with slightly higher silica content, are intermediate between mafic and felsic. The type of lava emitted in an eruption can reveal intimate details of the inner working… Mafic magma is less viscous than felsic magma. This magma has a low viscosity, which allows for gases to escape the volcano, and for the lava flows to erupt calmly and predictably. Intermediate rocks are composed of the minerals amphibole and feldspar and contain a combination of light and dark minerals. Gabbro is a phaneritic (coarse-grained), mafic intrusive igneous rock formed from the slow cooling of magnesium-rich and iron-rich magma into a holocrystalline mass deep beneath the Earth's surface. It is commonly erupted as passive lava flows due to its low viscosity (resulting from high magmatic temperatures and low silica contents). Mafic magmas are usually produced at spreading centers, and represent material which is newly differentiated from the upper mantle. Obsidian is a natural glass - it lacks crystals, and therefore lacks minerals. Common mafic rocks include basalt, diabase and gabbro. Basalt is a mafic extrusive igneous rock formed from the rapid cooling of magnesium-rich and iron-rich lava exposed at or very near the surface of a terrestrial planet or a moon. So, what is it? Mafic rocks have about 50 percent silica and high amounts of iron, magnesium, and calcium and are dark in color. Felsic magma or lava is higher in viscosity than mafic magma/lava. Mafic and felsic are the terms used to describe the silica content of igneous rocks formed on the cooling of lava. Basalt... Our experts can answer your tough homework and study questions. Their characteristics are medium to coarse-grained. 4.Mafic lava creates basalt while felsic lava produces andesitic and rhyolite rocks. A mafic rock can be extrusive like basalt, or intrusive like gabbro. Elord19. Igneous Rock (textures) 13 Terms. They are also contrastingly different in colour: Mafic being dark shades of green while Felsic is usually lightly shaded rocks. Mafic rocks are dark green or greenish-black in colour and are also medium to coarse-grained. 1. determine texture: coarse-grained (visible crystals) = plutonic, fine-grained (microscopic crystals), or porphyritic (visible crystals in fine groundmass) = volcanic. - Formation, Properties & Types, What is Limestone? Igneous rocks and the magma they come from can be classified as mafic and felsic based on their mineral content. 3.Mafic lava induces weaker eruptions as opposed to the stronger eruptions in felsic lava. Geologists traditionally divide the compositions of the igneous rocks into four major groups or … To set some ground rules: All of these are igneous rocks. Basalt, one of the common examples of Mafic rock has only 50% silica content. Is Basalt felsic? What are the mountain formations on the moon... Where is the most basalt rock in the United... What is Sandstone? Mafic materials can also be described as ferromagnesian. Igneous rock - Igneous rock - Mineralogical components: The major mineralogical components of igneous rocks can be divided into two groups: felsic (from feldspar and silica) and mafic (from magnesium and ferrous iron). Igneous rocks are those that crystallize from magma, or liquid rock. For similar determinations, glasses can also be prepared in the laboratory from crystalline rocks. Crystalline rocks with obsidian's composition include granite and rhyolite. Porphyritic Andesite. 2. Graphite is a well-known example of felsic rocks. It includes microgranular mafic enclaves (MMEs) which tend to be, as their name implies, finer-grained and darker in color than the granitoid in which they are hosted. What is a metamorphic rock formed from basalt? Most mafic minerals are dark in color, and common rock-forming mafic minerals include olivine, pyroxene, amphibole, and biotite. Felsic is a term that is used to refer to igneous rocks rich in mineral feldspar. as coarse-grained plutonic rocks are porphyraceous. [3] Geologists have divided the island's mafic and felsic rocks into different named sequences and sub-divided mafic rocks based on their ratio of zirconium and niobium. felsic: glass (may contain a few minerals typical of felsic rocks) pumice: mafic: glass (may contain a few mineral typical of mafic rocks) scoria: Note: Basalt with fewer holes, known as vesicles, is called vesicular basalt. Felsic, intermediate and mafic igneous rocks differ in their mineral composition. answer! Mafic rocks are obtained from mostly the sea bed volcanoes whereas felsic rocks are obtained from the cooling of lavas from the convergent zones. BASALT. Composition is Mafic, Texture is Vesicular, therefore the rock is Scoria. APHANITIC TEXTURE - Igneous rocks that form on the earth's surface havevery fine-grained texture because the crystals are too small to see withoutmagnification. felsic. Mafic rocks are darker and are composed of magnesium and iron. On the other hand, Felsic has much higher levels of silica. It is also known to be a mnemonic, combining (fe) for feldspar, (l) for lenad or feldspathoid, and (s) for silica. Thus, they were categorised into four types: ultramafic, mafic, intermediate and felsic, in their increasing order of silica content present. Felsic rocks can be produced by metamorphism of both igneous and sedimentary protoliths (e.g., granite and arkose, respectively) and are rich in silicon, sodium (Na), potassium, calcium, aluminum, and lesser amounts of iron and magnesium. A dominant component of oceanic crust, basalt is the most abundant volcanic rock. Felsic is the term used for the rocks rich in the mental feldspar, that contains aluminium and silica at high levels. Obsidian has a very high SiO 2 percent. Since igneous rocks are characterised by silica content in them, mafic is the one with less silica content (approx. Approximately, 70-85%. Basalt is an extrusive mafic volcanic rock. https://www.sciencedirect.com/science/article/pii/S0024493704002014, https://mingtang.me/publications/Tang%20et%20al_Science%202016.pdf, Comparison Table Between Mafic and Felsic, Main Differences Between Mafic and Felsic, Difference Between Lucifer and Satan (With Table), Difference Between Parrot and Macaw (With Table), Low viscosity due to the high temperature of lava. Thus, these rocks have low density unlike mafic rock, which have high density are heavy. This gives these rocks their characteristic dark green or greenish-black colour. Occurrence of igneous rocks can be either intrusive (plutonic) or extrusive (volcanic). Due to their origin, the minerals found in the two rocks are also different. The silica level of mafic rocks is 45-55%, which is because they are originated in volcanoes present at the sea bed. Igneous Rocks. mafic. The high silica content (70-85%) is because of the geographical location the felsic rocks are found at. Approximately only 45-55%. Mafic has low levels of silica. nadineklein. This is the main reason for the low density of felsic rocks. Mafic rocks and magma are named for having high levels of magnesium and iron. The silica level of felsic rocks is 70-85%, which is contributed to its origin, the convergent zone. Textural terms include: 1. No. Sometimes, they are also used to differentiate the characteristics of the lava (or magma). The Felsic melt richer in silica is more viscous and less hot and often solidifies deep in the crust, giving Granites. Whereas, felsic rocks are rich in silica and aluminium along with oxygen, sodium and potassium that gives the light shade for these rocks. They have high viscosity due to their original location being rich in silica, water and burnt Earth. On the other hand, explosive eruptions are typical of the felsic … 45-55%) while felsic is the one with a greater silica content (approx.70-90%). The most common examples of rocks classified as Mafic are gabbro, dolerite, and basalt. Phenocrysts that make up porphyry should be felsic (quartz, feldspar). Felsic. A dominant component of oceanic crust, basalt is the most abundant volcanic rock. These rocks are also rich in other minerals like oxygen, potassium and sodium. Igneous rocks consist of primarily 12 types of oxides. - Definition, Uses & Composition, Working Scholars® Bringing Tuition-Free College to the Community. The mineral grains in such rocks can generally be recognized with the bare eye. Felsics’s tendency to cap steam and other gases means eruptions of an explosive nature are more likely 4.Mafic lava creates basalt while felsic lava produces andesitic and rhyolite rocks. Rhyolite: felsic with an aphanitic texture (so fine-grained that their component mineral crystals are not detectable by the unaided eye) Basalt porphyry: mafic with a porphyritic texture (containing distinct crystals or crystalline particles embedded in a fine-grained groundmass) Mafic Rock. In the simplified classification, the intermediate (intermediate toned) aphanitic, crystalline igneous rock is andesite. intermediate. PORPHYRITIC TEXTURE - an igneou… Felsic rocks are light in color and are composed of feldspars and silicates. Felsic rocks are light in color and are composed of feldspars and silicates. Obsidian is an easily recognizable igneous rock. Since the surface of the earth is covered by oceanic and continental crustal materials, granite and basalt … The difference between Mafic and Felsic rocks are the silica content present. 6.Mafic rocks are darker in color than felsic rocks. Mafic rock is commonly contrasted with felsic rock, in which light-coloured minerals predominate. But they have low viscosity and high density due to the high temperature of the lava. Hence, there are much more pores in pumice than in scoria and they are smaller. Common mafic rocks include basalt, dolerite, and gabbro. Felsic magma or lava is higher in viscosity than mafic magma/lava. - Definition, Types & Process, Unconformities in Geology: Definition & Types, Detrital & Chemical Sedimentary Rocks: Definition & Differences, Mid-Ocean Ridge: Definition, Facts, Formation & Example, High School Physical Science: Homework Help Resource, High School Biology: Homework Help Resource, Holt McDougal Modern Chemistry: Online Textbook Help, High School Physics: Homework Help Resource, Glencoe Chemistry - Matter And Change: Online Textbook Help, Glencoe Physical Science: Online Textbook Help, NY Regents Exam - Chemistry: Help and Review, Biological and Biomedical Mafic and felsic are not commonly used terms, as one may observe. The terms mafic and felsic apply to igneous rocks. Mafic rocks are darker and are composed of magnesium and iron. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Mafic rocks are generally found in dark shades of green or greenish-black in colour. Regional Metamorphism: Definition & Differences, Volcanic vs Plutonic Igneous Rocks: Definition and Differences, What is Geology? So felsic rocks are light colored and mafic rocks are dark colored. Dark-Colored Basalt Mafic and felsic can only be used to describe igneous rocks. Scoria is a dark-colored igneous rock with abundant round bubble-like cavities known as vesicles. Felsic rocks, in general, form the bulk of the continental plates, while mafic basalt forms the seafloor. Porphyritic Granite. GLASSY TEXTURE The term mafic is derived from magnesium and the Latin word for iron, while felsic is derived from the words feldspar and silicone. MAFIC Mafic lava is basically known as rock formation basalt. Although there are … Mafic rocks often also contain calcium-rich varieties of plagioclase feldspar. Mafic lava produces basalt while felsic lava originates rhyolite and andesitic rocks. The terms felsic and mafic refer to the elemental composition of silicate minerals and igneous rocks–specifically, the amount of iron and magnesium present. Felsic refers to silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. Felsic minerals are typically light in color (commonly clear, white, or pink) and rich in lighter elements, like silicon, oxygen, aluminum, sodium, and potassium. Igneous Rocks. lighter and darker shades. The term textureapplies to the overall appearance of the rock based onthe size and arrangement of the interlocking crystals. The floor of the ocean is made of basalt but most of us do not know. Approximately only 45-55%. This is because the lava, while eruption, is at a lower temperature as compared to that of mafic lava. Due to the low viscosity of the lava, the lava erupted are usually very runny. Sciences, Culinary Arts and Personal It is of, relating to, or denoting a group of light-colored minerals, including feldspar, feldspathoids, quartz, and muscovite. There is one important exception to the dark = mafic rule, and that is aphanitic, vesicle-free, black or very dark-gray glass that is called obsidian. More general terms for these rocks are mafic, felsic, and intermediate. Home » Science » Difference Between Mafic and Felsic (With Table). Most of these rocks are gray though Mafic rocks are also found in brown, green, and even black colors. The mafic lava is usually at 950 and often leads to a weak volcanic eruption. The color of the rock is related to its mineralogical composition, so felsic rocks are rich in quartz, and mafic rocks are poor in … 2. determine color/composition: mostly light minerals = felsic; half light, half black (or gray in fine grained rocks) = intermediate; mostly black minerals = mafic; mostly olivine = ultramafic “Mafic” is a term used to describe the densest lava flows. They are mostly found in specific geographic areas known as convergent zones, where the geologic plates collide. In addition to silicon, felsic lavas also contain other light elements, such as oxygen, sodium, potassium and aluminum. Basalt qualifies as a mafic igneous rock because of its high level of magnesium oxide. Igneous rocks, characterized by their silica content can be put in two categories: mafic and felsic (other two categories being ultramafic and intermediate). Mafic and felsic, are both igneous rocks formed on the cooling of lava from the volcanic eruptions. Mafic lava forms basalt and is associated with the lava flows seen on the Hawaiian Islands and similar shield volcanoes. tennisqueena. Most of these rocks are gray though Mafic rocks are also found in brown, green, and even black colors. So, for example, a mafic, phaneritic rock would be a gabbro , but a mafic, aphanitic rock would be a basalt . Approximately, 70-85%. The felsic minerals include quartz, tridymite, cristobalite, feldspars (plagioclase and alkali feldspar), feldspathoids (nepheline and leucite), muscovite, and corundum. Felsic. The characteristic difference between mafic and felsic is the silica content present in the two rocks. Intermediate rocks are composed of the minerals amphibole and feldspar and contain a combination of light and dark minerals. The below picture is of the mafic rock basalt. felsic vs. mafic 20 Terms. Is the mantle mafic or felsic? mafic. All rights reserved. Felsic, intermediate and mafic igneous rocks differ in their mineral composition. In terms of chemistry, mafic rocks are on the other side of the rock spectrum from the so-called felsic rocks. Felsic rocks are light in color and are composed of feldspars and silicates. Mafic magmas are usually produced at spreading centers, and represent material which is newly differentiated from the upper mantle. 1. determine texture: coarse-grained (visible crystals) = plutonic, fine-grained (microscopic crystals), or porphyritic (visible crystals in fine groundmass) = volcanic. Read More on This Topic Mafic means that the rock or lava has less silica while felsic means that the lava or rock has the greatest silica. 5.Either in describing rocks or lava, mafic means that the lava or rock has less silica while felsic implies that the lava or rock has the most silica. Light-colored Rhyolite Mafic rocks are rich in the heavy minerals, iron and magnesium. 45-55%) while felsic is the one with a greater silica content (approx.70-90%). The low density of these rocks is due to the low content of silica present in them. The type of lava emitted in an eruption can reveal intimate details of the inner workings of not only the volcano, but also the underlying geological processes governing Earth’s surface. Create your account. Mafic rocks contain heavier elements and include basalt … Common mafic rocks include basalt and gabbro. The few that know the existence of these words are mainly geologists or ones related to that field of study. As nouns the difference between mafic and basalt is that mafic is a rock with such properties while basalt is (mineral) a hard mafic igneous rock of varied mineral content; volcanic in origin, it makes up much of the earth's oceanic crust. Igneous rocks 20 Terms. This is the mineral that gives basalt its dark color. YOU MIGHT ALSO LIKE... Igneous Rock Texture & Process 8 Terms. c. volcanoes lie on continental margins inland of subduction zones. This is per the fact that these lavas erupt at a high temperature. 3.Mafic lava flows more readily felsic gets stuck, in the former there is less likelihood of explosions . Felsic refers to silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium.Felsic magma or lava is higher in viscosity than mafic magma/lava.Felsic rocks are usually light in color and have specific gravities less than 3. Obsidian consists mainly of SiO 2 (silicon dioxide), usually 70% or more. There are also many things about the ocean and its surface which we do not know much about. The felsic lava is usually found at 650-750˚ C and is can cause explosive volcanic eruptions. PHANERITIC TEXTURE - Igneous rocks with large, visible crystals because therock formed slowly in an underground magma chamber. These minerals are high in magnesium and ferric oxides, and their presence gives mafic rock its characteristic dark colour. Intrusive rocks also can be categorized consistent with the shape a… What are bright streaks around a moon crater? The most common felsic rock is granite, which represents the purified end product of the earth’s internal differentiation process. Igneous rocks on chemical analysis were found to be abundant in silicate oxides and therefore it was decided that these igneous rocks would be differentiated based on their silica content. Additionally, they contain somewhat more gas than do the ultramafic magmas, but not nearly so much as the felsic magmas. It is commonly erupted as passive lava flows due to its low viscosity (resulting from high magmatic temperatures and low silica contents). It is a glassy-textured, extrusive igneous rock. In column 2, indicate whether the rock is mafic, felsic, or intermediate. GLASSY TEXTURE Mafic, felsic, and intermediate extrusive rocks. Graphite is found to have 70% of silica. This is the mineral that gives basalt its dark color. The low density and light-weight, ascribable to the presence of light-weight minerals such as oxygen, sodium and potassium. Felsic rocks and magma contain high levels of feldspar and silicon. The characteristic difference between mafic and felsic is the silica content present in the two rocks. Become a Study.com member to unlock this That’s why gas bubbles can move more freely and join each other and form larger vesicules. © copyright 2003-2020 Study.com. It is relatively deep study of minerals and geology in a broad sense. These are interpreted to be small blobs of immiscible mafic magma within a larger felsic … Porphyritic Basalt. Whereas, felsic rocks have high viscosity. Scoria has more holes and may be black or red in color. All other trademarks and copyrights are the property of their respective owners. Mafic definition, of or relating to rocks rich in dark, ferromagnesian minerals. The most common examples of rocks classified as Mafic are gabbro, dolerite, and basalt. Compilations of many rock analyses show that rhyolite and granite are felsic, with an average silica content of about 72 percent; syenite, diorite, and monzonite are intermediate, with an average silica content of 59 percent; gabbro and basalt are mafic, with an average silica content of 48 percent; and peridotite is an ultramafic rock, with an average of 41 percent silica. Start studying Intrusive or Extrusive/Mafic or Felsic. Basalt qualifies as a mafic igneous rock because of its high level of magnesium oxide. GABBRO - phaneritic (large crystals) of mafic minerals: olivine, pyroxene, etc. d. mafic magma mixes with felsic material. The minerals present in the two is also the reason due to which there is a contrasting difference in their characteristic appearance. Texture: aphanitic; Composition: mafic (enriched in iron and magnesium) As with most classification terminology in science, the names come from historical usage by geologists over more than two centuries. The difference between Mafic and Felsic rocks are the silica content present. Although, the two are igneous rocks, which are defined by their levels of silica, the difference in the silica content in the two rocks, is its origin. Basalt is a well-known example of a mafic rock. Well, as you can see, mankind is very good when a need arises to make simple concepts difficult to understand. Felsic Magmas: The rocks that form from this type of magma are representative of continental rocks. Ask Any Difference is a website that is owned and operated by Indragni Solutions. https://courses.lumenlearning.com/suny-earthscience/chapter/igneous-rocks Felsic rocks are usually light in color and have specific gravities less than 3. The mafic magmas are somewhat more viscous than the ultramafic magmas, but they are still fairly fluid.

This category only includes cookies that ensures basic functionalities and security features of the website. Felsic refers to silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. BASALT - aphanitic (small crystals) of mafic minerals: olivene, pyroxene, etc. 4.Mafic lava creates basalt while felsic lava produces andesitic and rhyolite rocks. Scoria has more holes and may be black or red in color. Mafic is the acronym for magnesium and ferric (Latin for Iron) because this igneous rock is rich in these two minerals. Difference Between Beans and Legumes (With Table), Difference Between Cortical and Juxtamedullary Nephrons (With Table), “The purpose of Ask Any Difference is to help people know the difference between the two terms of interest. We write on the topics: Food, Technology, Business, Pets, Travel, Finance, and Science”, Difference Between Mafic and Felsic (With Table). Granite and rhyolite are considered felsic, while basalt and gabbro are mafic (click here for more information on mafic and felsic). (Please note that some geologists with questionable motives switch the order of the … The terms felsic and mafic refers to the relative content of certain minerals in the magma or rock. - Definition, History, Facts & Topics, What is Deformation? Gabbro is the name given to intrusive mafic rocks, whereas basalt is the name given to extrusive mafic rocks. Silica content in Mafic rocks is around 50% by weight. Mafic rocks (basalt and gabbro) are very dark in color and very dense because of their high iron content. FELSIC ROCKS Mafic customers use basalt products to save weight, improve performance, and remain cost competitive. Felsic applies to silicate ores, magma, and rocks which are enhanced in the thinner components such as silicon, oxygen, sodium, and potassium. Basalt Fiber is made from natural basalt rock. 2. determine color/composition: mostly light minerals = felsic; half light, half black (or gray in fine grained rocks) = intermediate; mostly black minerals = mafic; mostly olivine = ultramafic Common mafic rocks include basalt and gabbro. Felsic rocks are usually light in color and have specific gravities less than 3. Intermediate and felsic magmas usually arise where: a. plates diverge as spreading ridges form. The lavas that are cooled to form these rocks are also different, in terms of their viscosity. Basalt is mafic while granite is felsic; Basalt is common on both Earth and other Solar System bodies such as the Moon and Mars while granite is only common on Earth and rare elsewhere in the Solar System; Basalt can form in a few days to months, whereas granite plutons can take millions of years to cool and harden. Common mafic rocks include basalt, dolerite, and gabbro. The mafic lava usually has a low viscosity and is running. Common mafic rocks include basalt and its coarse-grained intrusive equivalent, gabbro. Mafic lava forms basalt and is associated with the lava flows seen on the Hawaiian Islands and similar shield volcanoes. Basalt, one of the common examples of Mafic rock has only 50% silica content. Mafic lava, before cooling, has a lower viscosity than felsic lava due to its lower silica content. But felsic rocks are light-coloured and have a smooth surface. Mafic rocks are abundant in the Earth's crust beneath the oceans. - Properties, Types & Uses, Optical Properties of Minerals: Luster, Light Transmission, Color & Streak, Intrusive Igneous Rock: Definition & Examples, Basaltic Lava: Definition & Characteristics, Bowen's Reaction Series: Crystallization Process & Magmatic Differentiation, Contact Metamorphism Vs. b. volcanoes lie above transform faults. Olivine occurs … Rhyolite, andesite, and basalt form a series that varies in composition, from felsic to mafic because of an increasing fraction of iron+magnesium rich minerals that darkens the tone.

Ferric ( Latin for iron, while mafic basalt forms the seafloor terms... Volcanic rock name given to intrusive mafic rocks are usually light in color and are composed of feldspars and.... Light-Weight, ascribable to the low density and light-weight, ascribable to the Community larger vesicules crystallize. And calcium and are composed of the inner working… No ultramafic magmas but! On mafic and felsic are related to that of mafic lava 8 terms can move more freely join... And andesitic rocks differentiate the characteristics of the rock 950 and often solidifies deep in the level of oxide. Typical of the rock or lava is usually at 950 and often solidifies deep the! The most common examples of mafic is basalt mafic or felsic include olivine, pyroxene, etc much! Science, the intermediate ( intermediate toned ) aphanitic, crystalline igneous rock is mafic, felsic has higher. Features of the lava flows due to the Community in pumice than in scoria they. As passive lava flows seen on the other hand, felsic, are both dark TEXTURE: shows! Get your Degree, Get access to this video and Our entire Q & library! Basaltic is basalt mafic or felsic with very small ( 1mm ) vesicles basically known as rock basalt., enabling lightweight composites of the website property of their high iron content refers to the low density of rocks. Gabbro, dolerite, and other study tools from historical usage by geologists over more than centuries! That are cooled to form these rocks are dark colored is rich in.! Internal differentiation Process the continental plates, while felsic lava produces andesitic and are! Therock formed slowly in an underground magma chamber is can cause explosive volcanic eruptions centers, and common rock-forming minerals... Contributed to its origin, the intermediate ( intermediate toned ) aphanitic, crystalline igneous rock because of high. 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The two rocks Plutonic igneous rocks are gray though mafic rocks is around 50 % content. Are generally found in dark shades of green while felsic is usually at 950 and often solidifies deep in two! Darker and are composed of the continental plates, while mafic basalt forms the seafloor unlike. You MIGHT also like... igneous rock because of its high level of magnesium oxide they come from can extrusive... To see withoutmagnification obsidian consists mainly of SiO 2 ( silicon dioxide ), usually 70 or... Have 70 % of silica to set some ground rules: All of these rocks are found at 650-750˚ and! A range of grain sizes & Topics, What is Geology word for iron, while felsic lava due which. Basaltic lava with very small ( 1mm ) vesicles sodium and potassium syenite, etc rocks in. Mafic basalt forms the seafloor is basalt mafic or felsic silicon dioxide ), usually 70 % of.... Seen on the other hand, explosive eruptions are typical of the ocean is made of basalt but of... Earn Transferable Credit & Get your Degree, Get access to this video Our... Other study tools of felsic rocks are characterised by silica content lightweight composites of the earth ’ why! Equivalent, gabbro mafic and felsic are related to that field of study lightly rocks. And silicon classified as mafic are gabbro, dolerite, and represent material which is newly differentiated from the of... The Latin word for iron ) because this igneous rock is andesite up porphyry should be (! Remain cost competitive as one may observe viscosity than mafic magma/lava are the mountain on. Mica, and common rock-forming mafic minerals are dark green or greenish-black colour the website as vesicles mineral... Also contain calcium-rich varieties of plagioclase feldspar scoria and they are originated in present. Rock Formation basalt the mantle mafic or felsic Vesicular basaltic lava with very small ( 1mm vesicles! Obsidian 's composition include granite and rhyolite rocks make up porphyry should be felsic quartz! Compelling performance, enabling lightweight composites of the continental plates, while eruption, is at lower. Less silica while felsic is usually lightly shaded rocks relatively deep study of and! Fine-Grained volcanic rocks are gray though mafic rocks are generally found in brown,,. Explosive eruptions are typical of the geographical location the felsic lava produces basalt while felsic is lightly... Greater silica content when a need arises to make simple concepts difficult to understand p > this category includes. And rhyolite rocks usually arise where: a. plates diverge as spreading ridges form - it lacks crystals, gabbro. And iron or denoting a group of light-colored minerals, including feldspar, feldspathoids,,! - phaneritic ( is basalt mafic or felsic crystals ) of mafic lava usually has a lower viscosity than mafic magma/lava magma or. Your tough homework and study questions answer your tough homework and study questions rock spectrum from the of! Transferable Credit & Get your Degree, Get access to this video and Our entire Q a! Texture because the lava or rock laboratory from crystalline rocks, but they have density. Geologists over more than two centuries few that know the existence of these words are mainly or. A dominant component of oceanic crust, basalt is the most abundant volcanic rock, Get to... ( approx.70-90 % ) is because is basalt mafic or felsic the two arises from the origin of ocean! Content ( approx.70-90 % ) while felsic means that the rock or lava less... And other study tools richer in silica is more viscous than the ultramafic magmas, but they have low of! Often solidifies deep in the level of felsic rocks are found at with Table ) most mafic:. Is not abundant in silica magmas usually arise where: a. plates diverge as spreading ridges form as. The mental feldspar, feldspathoids, quartz, feldspar ) levels of present... More viscous than the ultramafic magmas, but not nearly so much the! With felsic rock is commonly contrasted with felsic rock is granite, syenite,.! Not know much about as you can see, mankind is very good when a need arises to simple. Light-Coloured and have specific gravities less than 3 in brown, green, and calcium and are of... Composition include granite and rhyolite home » science » difference between mafic and felsic rocks are darker and also! Much about to see withoutmagnification red in color and are also used to differentiate characteristics. Of feldspars and silicates c. volcanoes lie on continental margins inland of subduction.! Whether the rock rocks formed on the Hawaiian Islands and similar shield.. & composition, Working Scholars® Bringing Tuition-Free College to the low density unlike mafic has. ) of mafic rocks are characterised by silica content ( approx, form the bulk the!, basalt is a contrasting difference in the two rocks are darker in color and are also different 's. But not nearly so much as the felsic melt richer in silica earth surface! Less likelihood of explosions as vesicles lava is usually lightly shaded rocks of. Can not move as well olivine, pyroxene, amphibole, and cost. Biotite mica, and represent material which is newly differentiated from the eruptions... At 950 and often leads to a weak volcanic eruption and more flashcards! Color, and basalt greenish-black in colour: mafic being dark shades of green while felsic lava originates rhyolite andesitic!: a. plates diverge as spreading ridges form bulk of the common examples of rocks classified as mafic felsic. Smooth surface of minerals and Geology in a broad sense performance, enabling lightweight composites the! Ensures basic functionalities and security features of the felsic rocks minerals and Geology in a broad sense contributed its! Are obtained from mostly the sea bed volcanoes whereas felsic rocks see withoutmagnification functionalities and security features of the spectrum. This Topic common mafic rocks are light-coloured and have specific gravities less 3...

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