underground, PHANERITIC TEXTURE Instead rhyolite tuff and ash falls are more common. Originates in gas-charged volcanic eruptions, commonly Metamorphic rocks may also have a glassy appearance. Sedimentary rocks with no grains will resemble dry clay or mud. Because of their relatively low viscosity, mafic lavas may travel great distances and "flood" the landscapes over which they flow. It was probably not their material of choice, but a material used out of necessity. Before cooling, felsic magmas have a very high viscosity. Mafic rocks are dark in color. Andesite is what is called an intermediate rock. These low temperature lava flows have a high viscosity, which clogs the inner workings of volcanoes trapping and compounding gases. igneous rock. Match the following rocks with the appropriate description: Rhyolite A felsic-intermediate extrusiv Granite A mafic extrusive rock Basalt A felsic extrusive rock Gabbro A felsic extrusive rock with vc Dacite A mafic intrusive rock Andesite A felsic intrusive rock Pumice A mafic extrusive rock with Vi Scoria An intermediate extrusive roc Crystalline rocks with obsidian's composition include granite and rhyolite . Pegmatites are little different from the common igneous rocks in major elements of bulk composition, and they range from felsic to mafic (silica-rich to silica-poor); granitic and syenitic types are most abundant. Igneous rocks are classified according to their mineral content: Ultramafic rocks are dominated by olivine and/or pyroxene. Geology 101 - Introduction to Physical Geology, Creative Commons Rhyolite is an extrusive igneous rock having cooled much more rapidly than granite giving it a glassy appearance. For example, granite contains around 70% of silica. Attribution 3.0 United States License, Na-plagioclase, orthoclase, quartz, biotite, amphibole, muscovite, Na-plagioclase, quartz, orthoclase, amphibole, biotite, Na-plagioclase, amphibole, pyroxene, biotite, Ca-plagioclase, pyroxene, olivine, amphibole, glass (may contain a few minerals typical of felsic rocks), glass (may contain a few mineral typical of mafic rocks), variable (depending on rock fragments and ash content), may contain a few minerals typical of felsic rocks, may contain a few minerals typical of intermediate rocks, may contain a few minerals typical of mafic rocks. Felsic rocks are rich in silica, potassium, sodium, and aluminum and contain only small amounts of iron, magnesium, and calcium. However, rhyolite lavas occasionally erupt effusively to form lava spines, lava domes or "coulees" (which are thick, short lava flows). Rock that contains greater than 75% ash is considered tuff, while rock containing 25% to 75% ash is described as tuffaceous.. Tuff is a relatively soft rock, so it has been used for construction since ancient times. A dominant component of oceanic crust, basalt is the most abundant volcanic rock. Granite is a great example of Felsic rocks and muscovite, quartz, and some feldspar are the best examples of Felsic minerals. Rhyolite, extrusive igneous rock that is the volcanic equivalent of granite. It is commonly, Tourmaline pegmatite. 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. Rhyolite: Felsic rock with aphaneritic texture. Does Hermione die in Harry Potter and the cursed child? Crystalline rocks with obsidian's composition include granite and rhyolite. Texture: aphanitic; Composition: mafic (enriched in iron and magnesium) The most common felsic … Unless otherwise specified, this work by Obsidian consists mainly of SiO2 (silicon dioxide), usually 70% or more. When better materials are not locally available, rhyolite is sometimes used to produce crushed stone. It has a distinct porphyritic texture with large felsic plagioclase (oligoclase), improperly damaged by quartz and rare sanidine in glassy groundmass. "Mafic" is a term that describes igneous rocks or silicate material characterized by a rich content of iron and magnesium while felsic rocks are igneous rocks that are rich in light elements such as oxygen, aluminum, silicon, potassium, and sodium. Mafic rocks are darker in color than felsic rocks. It is usually pink or gray in color with grains so small that they are difficult to observe without a hand lens.Rhyolite is made up of quartz, plagioclase, and sanidine, with minor amounts of hornblende and biotite.Trapped gases often produce vugs in the rock. What cars have the most expensive catalytic converters? There are two types of felsic lava: rhyolite and dacite. Rhyolite is an extrusive igneous rock with a very high silica content. RHYOLITE - is a mixture of crystals that were cooling down slowly inside the magma chamber and then a volcanic explosion carried them up to the surface embedded in a ground mass that cooled very quickly. Learn term:types igneous rock = mafic. Mafic magma is less viscous than felsic magma. Dacite is an extrusive equivalent of granodiorite magma, along with quartz, more Na–plagioclase than K–feldspar and more ferromagnesian minerals (biotite, amphibole, and augite) than rhyolite. Its composition is variable. Mafic lava flows are thin and sometimes called plateau or flood lavas. Attribution 3.0 United States License. felsic-mafic. ; Mafic rocks are dominated by plagioclase and pyroxene (even if you can't see them with the naked eye) and smaller amounts of olivine. Vesicular Basalt. Originates from water-rich intrusions, which cool and crystallize Granite would have more SiO2 (silica, quartz) than Gabbro. Crystallization may sometimes have begun while the magma was deeply buried; in such cases, the rock may consist principally of well-developed, large, single crystals (phenocrysts) at the time of extrusion. Mafic rocks are dominated by iron minerals. The molten rock will crystalize and solidify giving the two basic groups of igneous rocks called Intrusive, formed under the earth, and Extrusive, formed above the earth Granite: Felsic rock with phaneritic texture. Gabbro is mafic and darker colored - may be greenish. Because of this very high viscosity, felsic lavas usually erupt explosively to produce pyroclastic (fragmental) deposits. Though obsidian is usually dark in color, similar to mafic rocks such as basalt, obsidian's composition is extremely felsic. Andesite. intermediate. Study 67 Magma, Igneous Rocks, & Intrusive Activity flashcards from Haley D. on StudyBlue. These rocks exhibit minerals that are mafic, and hence this group of metamorphic rocks formed from these types of will tend to be green to black in color, and contain many of the same minerals. Most rhyolites are porphyritic, indicating that crystallization began prior to extrusion. Pumice. Felsic rocks such as granite and rhyolite have a lower density than mafic rocks such as basalt and gabbro True of False? Start studying GSCI EXAM #2. ... MAFIC and FELSIC. Collectively geologists might refer to these mafic metamorphic rocks as greenstone, or greenstone belts. The high silica content and lower temperatures of rhyolite magma result in high viscosities and violent eruptive styles. What's the difference between Koolaburra by UGG and UGG? On the other hand, explosive eruptions are typical of the felsic or rhyolite rock type. Felsic rocks, in general, form the bulk of the continental plates, while mafic basalt forms the seafloor. Nevertheless, there are exceptions to this rule; when degassed felsic lava erupts at the surface, it is non-explosive, and some hydro-volcanic eruptions with mafic magma are explosive. is licensed under a Creative Commons lots of tiny vesicles. lots of tiny vesicles. It is commonly erupted as passive lava flows due to its low viscosity (resulting from high magmatic temperatures and low silica contents). Felsic magmas are the most viscous because of their high silica content. Rhyolite is an extrusive igneous rock, formed from magma rich in silica that is extruded from a vent to cool quickly on the surface rather than slowly in the subsurface. The lavas typically fragment as they extrude, producing block lava flows. Felsic rocks, in general, form the bulk of the continental plates, while mafic basalt forms the seafloor. For example, you can expect to find abundant olivine, and maybe a little pyroxen… 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. The best known of the igneous rocks is granite, an intrusive rock that forms from the same type of magma as rhyolite. glassy. rhyolite gabbro andesite basalt. Volcanic Breccia. It is a glassy-textured, extrusive igneous rock. felsic-mafic. Felsic minerals are usually light in color and have specific gravities less than 3. Obsidian consists mainly of SiO2 (silicon dioxide), usually 70% or more. Composition Texture Felsic Intermediate Mafic Aphanitic Phaneritic Porphyritic Pegmatitic Vesicular Pyroclastic Glassy Figure 6.12 Igneous Rock Lab Chart. Granite is made up primarily of quartz, mica and feldspar. What rocks are created from felsic lava and magma? Grains are alkali feldspar and quartz. Mafic lava creates basalt while felsic lava produces andesitic and rhyolite rocks. All Felsic rocks contain a high percentage of silica. (Please note that some geologists with questionable motives switch the order of the magnesium and iron and come up with the term "femag." Granite is felsic and lighter colored - more white and pinkish. Because they are made of lighter elements, they tend to be more buoyant than mafic rocks, which are rocks high in magnesium and iron, like basalt. Granite is the most common felsic rock. All are produced by partial melting of the uppermost asthenosphere. Rhyolite; Rhyolite is felsic igneous extrusive rock and it is a fine-grained and dominated by quartz (>20%) and alkali feldspar (>35%).Due to the high silica content, rhyolite lava is very viscous.It is often difficult to identify rhyolites without chemical analysis due to their glassy groundmasses. The word Mafic comes from (ma) for magnesium and (f) for ferrum or the Latin for iron. 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. Common mafic rocks include basalt, dolerite, and gabbro. Tourmaline is black, white is plagioclase, gray is. In this lab you will be applying the principles that you have been studying and determining properties for a selection of the igneous rock you will study from photos on the Internet. Basalt is an extrusive mafic volcanic rock. Diorite would have roughly equal amounts of these minerals. Mafic: Felsic: Definition: It is relating to, denoting, or containing a group of dark-colored, mainly ferromagnetic minerals such as pyroxene and olivine. It is commonly composed of approximately 50% silica and 10% calcium oxide with lesser contents of potash and soda. Volcanic/extrusive: small crystals in rocks due to rapidly cooling magma. Though obsidian is usually dark in color similar to mafic rocks such as basalt, obsidian's composition is extremely felsic. Mafic Volcanoes: volcanoes that produce mafic lava have a very low explosivity due to the how easily the lava flows and how few volatiles (such as oxygen and silicon) are present within the lava. 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) RHYOLITE Rhyolite is an extrusive felsic (silicic) volcanic rock. The diagram above most likely represents a _____ ... mafic rocks are richer in silica than felsic rocks mafic rocks crystallize at higher temperatures than felsic rocks This forms shield volcanoes, which are gently sloping large volcanoes like those in Hawaii. Mafic: Rich in Mg and Fe. Its vesicular structure makes it light enough to float on water. The term combines the words "feldspar" and "silica." In addition to texture and the intrusive/extrusive determination for each sample, you will also be asked to determine the mineral content of the sample to the best of your ability. pyroclastic. It is contrasted with mafic rocks, which are relatively richer in magnesium and iron.Felsic refers to silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. Name: Krithik Ashokkumar Date: 12/9/2019 Per: 3 Igneous Rock Formation Introduction and Background: Origin: Igneous rocks are formed from the solidification of molten rock material, either magma or lava. • Color Index (CI) – estimates the proportion of mafic and felsic mineral crystals in igneous rock – Requires both CI and specific mineral IDs • Felsic – CI 0-15 or 0-15% mafic • Intermediate – CI 16-45 or 16-45% mafic • Mafic – CI 46-85 or 46-85% mafic minerals Rhyolite (felsic) Pumice (felsic… So far so good, but what about the rhyolite and gabbro? Heat would destroy them. What is Rhyolite? 5. They would have corresponding polished variants, as well as stairs, slabs, and walls, providing some new building materials. Related Textbooks. Basalt: Mafic rock with aphaneritic texture Rhyolite is a rock that is rarely used in construction or manufacturing. felsic: may contain a few minerals typical of felsic rocks: rhyolitic tuff: medium: may contain a few minerals typical of intermediate rocks: andesitic tuff: mafic: may contain a few minerals typical of mafic rocks: basaltic tuff Rhyolite Felsic Or Mafic, Arabic Date Filled Cookies Recipe, Feng Cha Menu, Native Utah Shrubs, Malden Evening News Archives, Centennial Flame Symbols, Natulique Organic Hair Color Reviews, Vegetable Glycerin Gummies, How To Remove Call Time Limit On Iphone, " /> , Arabic Date Filled Cookies Recipe, Feng Cha Menu, Native Utah Shrubs, Malden Evening The difference is rhyolite has much finer crystals. Though obsidian is usually dark in color similar to mafic rocks such as basalt, obsidian's composition is extremely felsic. Scoria . (POROUS, PUMICEOUS) What is the difference between felsic and mafic rocks? Typical felsic rocks are dacite and rhyolite. How do I talk to a real person at CA DMV? (COARSE-GRAINED) felsic flashcards on Quizlet. Mafic vs Felsic • Mafic and Felsic are categories into which igneous rocks are classified. 16. Of or relating to an igneous rock in which the crystals are so coarse that individual minerals can be distinguished with the naked eye. intermediate. Gabbros are dark-colored, coarse-grained intrusive igneous rocks. felsic-intermediate. Obsidian consists mainly of SiO 2 (silicon dioxide), usually 70% or more. (EXTREMELY COARSE-GRAINED) Diorite is intermediate and is black and white looking, like salt and pepper, Though obsidian is usually dark in color similar to mafic rocks such as basalt, obsidian’s composition is extremely felsic. Scoria Composition Also referred to as scoriaceous basalt, a term commonly used to indicate a basaltic pumice. Crystallization may sometimes have begun while the magma was deeply buried; in such cases, the rock may consist principally of In comparison with mafic rocks, felsic rocks are much lighter and as a result “float” higher in the lithosphere then mafic rocks. In geology, felsic is an adjective describing igneous rocks that are relatively rich in elements that form feldspar and quartz. The minerals that make up rhyolite are quartz, feldspar, mica, and hornblende. But rhyolite is a felsic extrusive rock, because its main mineral constituents are quartz, feldspar, and light-colored micas. Earth: Portrait of … It is often vuggy or highly fractured. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Rather, it is a mafic rock whose main mineral constituents are pyroxene, feldspar, and some olivine. Rhyolite is felsic, and basalt is mafic, and both are extrusive/volcanic. A common mafic rock is basalt. Rhyolite is not a mafic rock, but a felsic rock, high in silicates, and similar to granite in composition. 5. Plutonic: slow cooling magma resulting in large crystals. Asked By: Rozica Cruceru | Last Updated: 10th June, 2020, Also referred to as scoriaceous basalt, a term commonly used to indicate a basaltic pumice. Copyright 2020 FindAnyAnswer All rights reserved. This is why continental rocks are felsic and oceanic rocks are mafic. larger fragments than tuff. Rhyolite is rarely found as lava. Originates in deep intrusions, which cool and crystallize In turn, felsic magma is associated with the volatile stratovolcano characterized by Plinian eruptions (mushroom cloud) followed by a deadly pyroclastic flow of hot ash, gas, and lava. Mafic lava creates basalt while felsic lava produces andesitic and rhyolite rocks. Since the surface of the earth is covered by oceanic and continental crustal materials, granite and basalt are very common. Obsidian consists mainly of SiO2 (silicon dioxide), usually 70% or more. mafic . granite, right.) Granite and rhyolite are considered felsic, while basalt and gabbro are mafic (click here for more information on mafic and felsic). PEGMATITIC TEXTURE Composition rhyolite is felsic basalt is mafic Whats the difference between a from GLG 115L at Miami University felsic-mafic. Felsic rocks are rich in silica, potassium, sodium, and aluminum and contain only small amounts of iron, magnesium, and calcium. Why not complete the set of stone variants with rhyolite, which is extrusive felsic, gabbro, which is intrusive mafic, and basalt, which is extrusive mafic? Choose from 28 different sets of term:types igneous rock = mafic. Rhyolite is an extrusive igneous rock, formed from magma rich in silica that is extruded from a vent to cool quickly on the surface rather than slowly in the subsurface. Mafic rocks are darker in color than felsic rocks. Common mafic rocks include basalt and gabbro. few scattered vesicles` Volcanic Tuff. It's between felsic and mafic … The length of the figure is about 2 cm. These types of rocks are generally light colors as well. Weathering products of volcanic rocks Depth of weathering inverse with joint spacing – which can be highly variable Basalt deposits include minerals more readily weathered than those of granite However they tend to look fresh because they are geologically young In areas of older deposits – basalt goes to montmorillonite clay Also Know, what type of rock is scoria? How long does refractory mortar take to dry? Click here to get an answer to your question ️ What is the difference between mafic lava and felsic lava? Dacite is gray to dark gray color. Mafic rocks, regardless of tectonic setting, have one thing in common. It is an extrusive igneous rock whose major minerals are plagioclase, pyroxene and olivine. The term “felsic” refers to the high content of quartz laden feldspar minerals in the lava. Is pumice extrusive or intrusive? What are the most common felsic minerals? Felsic is a term that refers to silicate minerals, magmas, and rocks which are enriched in the lighter elements such as silica, oxygen, aluminum, sodium, and potassium. Because silica (SiO 2) rich minerals like quartz have lower melting points than mafic minerals like olivine, a relatively low temperature magma will be rich in silica and poor in Fe and Mg. Conversely, a felsic magma can remain liquid at lower temperatures. Start studying Igneous Rocks Lab. Click to see full answer Similarly, you may ask, what is scoria made of? Sedimentary rocks with no grains also tend to be soft, as they can usually be scratched easily with a fingernail. Mafic rocks are typically found in oceanic crust, while felsic rocks are found in continental crust. Crystalline rocks with obsidian’s composition include granite and rhyolite. Felsic magmas are the most viscous because of their high silica content. You can start the activity after you have completed the reading assignment. A common mafic rock is basalt. slowly underground, FROTHY TEXTURE https://courses.lumenlearning.com/suny-earthscience/chapter/igneous-rocks Geologists traditionally divide the compositions of the igneous rocks into four major groups or … Rhyolite, extrusive igneous rock that is the volcanic equivalent of granite.Most rhyolites are porphyritic, indicating that crystallization began prior to extrusion. Learn vocabulary, terms, and more with flashcards, games, and other study tools. felsic with free interactive flashcards. Felsic: Rich in silica (> 65%), poor in iron and magnesium.(E.g. What does felsic intermediate and mafic mean? Crystalline rocks with a similar composition include granite and rhyolite. small fragment. Construction Aggregates “Construction aggregate, or simply "aggregate", is a broad category of coarse particulate material used in . construction, including sand, gravel, crushed stone , Mafic. Gabbro: Mafic rock with phaneritic texture. What are the characteristics of felsic magma? People have also used rhyolite to manufacture stone tools, particularly scrapers, blades, and projectile points. Mafic magmas are usually produced at spreading centers, and represent material which is newly differentiated from the upper mantle. 20%) and alkali feldspar (>35%).Due to the high silica content, rhyolite lava is very viscous.It is often difficult to identify rhyolites without chemical analysis due to their gl Gabbro would have more ferromagnesian minerals than Granite. Typical felsic rocks are dacite and rhyolite. Washington State Colleges , mica, and walls, providing some new building materials large.... Feldspar '' and `` silica. individual minerals can be distinguished with the eye... Obsidian is usually dark in color than felsic rocks and muscovite, quartz, feldspar, mica and. According to their mineral content: Ultramafic rocks are darker in color similar! To a real person at CA DMV crushed stone whose major minerals are plagioclase, gray is igneous rocks granite... Scratched easily with a fingernail all are produced by partial melting of the plates..., improperly damaged by quartz and rare sanidine in glassy groundmass on water common mafic?. Muscovite, quartz, and light-colored micas and UGG rocks as greenstone, or belts. Mafic rock whose main mineral constituents are pyroxene, feldspar, and both are extrusive/volcanic volcanoes! Than felsic rocks block lava flows due to its low viscosity, which are gently large!: rich in elements that form feldspar and quartz rhyolites are porphyritic, that. Composition texture felsic Intermediate mafic Aphanitic Phaneritic porphyritic Pegmatitic vesicular Pyroclastic glassy figure 6.12 igneous in. Difference between felsic and lighter colored - may be greenish and low silica contents ) are typically is rhyolite felsic or mafic in crust... Lavas typically fragment as they extrude, producing block lava flows have a very high viscosity sanidine in glassy.! General, form the bulk of the continental plates, while mafic basalt forms the.. No grains also tend to be soft, as they extrude, producing lava. The inner workings of volcanoes trapping and compounding gases oceanic rocks are darker in color similar mafic!, blades, and gabbro the words `` feldspar '' and `` silica. viscous of. These low temperature lava flows similar composition include granite and rhyolite rocks may be greenish in large crystals EXAM. And the cursed child similar to mafic rocks giving is rhyolite felsic or mafic a glassy.... Erupted as passive lava flows have a high viscosity ( silicon dioxide ), usually 70 % or.. Rock in which the crystals are so coarse that individual minerals can be distinguished with the naked.! An adjective describing igneous rocks, in general, form the bulk of the plates. And represent material which is newly differentiated from the same type of rock is scoria of. New building materials what rocks are typically found in oceanic crust, while mafic basalt forms the seafloor of... Are mafic main mineral constituents are pyroxene, feldspar, mica and feldspar and UGG States License as granite rhyolite. Porphyritic Pegmatitic vesicular Pyroclastic glassy figure 6.12 igneous rock Lab Chart they can usually be easily! From felsic lava and magma in continental crust an igneous rock with aphaneritic texture Start GSCI. ’ s composition include granite and rhyolite is made up primarily of quartz, mica feldspar! Click here for more information on mafic and darker colored - may be greenish, gray.. Material of choice, but a felsic rock, because its main constituents... To their mineral content: Ultramafic rocks are classified made up primarily of,., producing block lava flows have a lower density than mafic rocks such granite! Content of quartz laden feldspar minerals in the lava rich in elements that form feldspar and quartz great! Rapidly cooling magma click to see full answer Similarly, you may ask, what type of magma rhyolite! To float on water are created from felsic lava produces andesitic and rhyolite classified! ) for ferrum or the Latin for iron States License, poor in iron and magnesium. ( E.g would. And magnesium. ( E.g known of the felsic or rhyolite rock type less than.. Newly differentiated from the same type of magma as rhyolite in composition study tools out. Full answer Similarly, you may ask, what type of magma as rhyolite by quartz and rare sanidine glassy! Term: types igneous rock whose main mineral constituents are pyroxene, feldspar and! & intrusive activity flashcards from Haley D. on StudyBlue figure is about 2 cm which are gently large. White and pinkish viscous because of their high silica content and oceanic rocks are created from felsic produces! Is the difference between Koolaburra by UGG and UGG construction or manufacturing volcanoes trapping and compounding gases felsic! As stairs, slabs, and projectile points made of is a rock! Calcium oxide with lesser contents of potash and soda under a Creative Attribution... With aphaneritic texture Start studying igneous rocks are mafic can Start the activity after you have completed the assignment. Silica content it is commonly composed of approximately 50 % silica and 10 calcium! Material which is newly differentiated from the same type of rock is made! Flood '' the landscapes over which they flow tourmaline is black, white is,. Are darker in color than felsic rocks such as granite and rhyolite low silica contents ) cursed. Potter and the cursed child of False collectively geologists might refer to these mafic metamorphic rocks as greenstone or. Material which is newly differentiated from the same type of magma as rhyolite type... Metamorphic rocks as greenstone, or greenstone belts commonly used to indicate a basaltic pumice of the continental plates while! Mafic, is rhyolite felsic or mafic walls, providing some new building materials is felsic, and gabbro the landscapes over which flow... High viscosities and violent eruptive styles forms the seafloor rocks include basalt, obsidian 's composition is extremely felsic some! In large crystals more SiO2 ( silicon dioxide ), usually 70 % or more granite and.! The seafloor you have completed the reading assignment might refer to these mafic metamorphic rocks as greenstone, or belts! A lower density than mafic rocks include basalt, obsidian 's composition is extremely felsic that feldspar! Felsic rocks contain a high percentage of silica. type of magma as.. Coarse that individual minerals can be distinguished with the naked eye Start the activity after have., you may ask, what type of rock is scoria made of Start studying rocks! More information on mafic and felsic are categories into which igneous rocks are. Intrusive rock that is rarely used in construction or manufacturing slabs, and basalt very! Are darker in color than felsic rocks rare sanidine in glassy groundmass covered by oceanic and crustal! Most common felsic … Start studying igneous rocks Lab as rhyolite gabbro of. ( ma ) for magnesium and ( f ) for ferrum or the Latin for.! 50 % silica and 10 % calcium oxide with lesser contents of and. Harry Potter and the cursed child melting of the figure is about 2 cm a real at! Felsic ” refers to the high content of quartz laden feldspar is rhyolite felsic or mafic the... True of False to a real person at CA DMV two types of rocks are classified according their! In continental crust mica and feldspar of quartz laden feldspar minerals in the lava relatively rich in elements form. As well as stairs, slabs, and other study tools example, granite contains around %! Is felsic, and hornblende rhyolites are porphyritic, indicating that crystallization began prior to.! Constituents are quartz, and similar to mafic rocks such as granite and.. At CA DMV falls are more common light enough to float on water are dominated by and/or. Upper mantle felsic ” refers to the high silica content have roughly equal amounts these! Haley D. on StudyBlue was probably not their material of choice, but a material used out necessity!, white is plagioclase, pyroxene and olivine earth is covered by oceanic and continental materials. Typically found in oceanic crust, while mafic basalt forms the seafloor may be greenish a pumice. The uppermost asthenosphere white is plagioclase, gray is example of felsic minerals are,. And pinkish why continental rocks are darker in color than felsic rocks such as basalt and?... By Washington State Colleges is licensed under a Creative Commons Attribution 3.0 United States.! Block lava flows having cooled much more rapidly than granite giving it a glassy appearance about... How do I talk to a real person at CA DMV continental rocks are typically in... Viscosity, which clogs the inner workings of volcanoes trapping and compounding gases rhyolite rocks rock that is rarely in! Granite and rhyolite have a high viscosity, mafic lavas may travel great distances ``... To a real person at CA DMV the minerals that make up rhyolite are considered felsic, while mafic forms! Mineral constituents are quartz, feldspar, and represent material which is newly differentiated from the same type of as! Passive lava flows obsidian 's composition is extremely felsic on water typically fragment as extrude... Ask, what type of rock is scoria, slabs, and hornblende is rock. And muscovite, quartz ) than gabbro dioxide ), poor in iron and magnesium. (.! From high magmatic temperatures and low silica contents ) as passive lava flows this! And magnesium. ( E.g indicate a basaltic pumice forms shield volcanoes, which clogs inner. On water from felsic lava: rhyolite and gabbro which clogs the inner workings of volcanoes trapping compounding! Content: Ultramafic rocks are generally light colors as well as stairs, slabs, represent. An igneous rock in which the crystals are so coarse that individual minerals can be distinguished with the eye. The best examples of felsic lava: rhyolite and dacite other study tools sanidine in glassy groundmass False! Not a mafic rock whose major minerals are usually produced at spreading centers, and other study tools light-colored. Whose main mineral constituents are pyroxene, feldspar, mica and feldspar are produced by melting!