Basalt is one of the main rocks to form the oceanic crust (the part of the Earth's surface under the Ocean). Rocks with high amounts of iron (Fe) tend to form minerals that are dark in color (such as olivine and pyroxene). Sometimes, felsic volcanic rocks contain small amounts (i.e. There are more than 700 known types of igneous rocks and most of them are formed under the earth’s crust since volcanic events are not all that frequent. This may not sound very specific, and in fact there are many different kinds of feldspar. Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Mafic rock is commonly contrasted with felsic rock, in which - Definition, History, Facts & Topics, What is Latitude? In order for a rock to be classified as felsic it generally needs to contain >75% felsic minerals; namely quartz, orthoclase and plagioclase. Not sure what college you want to attend yet? Visit the General Studies Earth & Space Science: Help & Review page to learn more. Like more familiar kinds of glass, it's high in silica. If you find a piece of pumice you know that a very violent eruption took place, because this foamy rock only forms under very high heat and pressure conditions. Get access risk-free for 30 days, The chemical name of a felsic rock is given according to the TAS diagram of Le Maitre (1975). Rocks with greater than 90% felsic minerals can also be called leucocratic, meaning 'light-coloured'.Template:Citation needed Felsite is a petrologic field term used to refer to very fine-grained or aphanitic, light-colored volcanicrocks which might be later reclassified after a more detailed microscopic or chemical analysis. Felsic minerals are usually light in color and have specific gravities less than 3. - Definition, Symbols & Examples, What is a Mountain Range? Why or why not? The Uniformitarianism principle states that geologic processes that have operated in the past are operating in … credit-by-exam regardless of age or education level. - Definition & Explanation, What is a Plateau? 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Sciences, Culinary Arts and Personal For phaneritic felsic rocks, the QAPF diagram should be used, and a name given according to the granite nomenclature. It may seem strange to think of a solid granite mountain as light weight, but compared to a basalt rock of the same size, it is. | {{course.flashcardSetCount}} How to Do Your Best on Every College Test. Aaron Slate, phyllite, metasiltstone, metatuff, felsic volcanic rocks, and Virgilina Greenstone underlie Ecoregion 45c in Virginia. Log in or sign up to add this lesson to a Custom Course. Rocks with greater than 90% felsic minerals can also be called leucocratic, from the Greek words for white and dominance. ludwig.guru Sentence examples for felsic rocks from inspiring English sources. However, rhyolite is extrusive. Because the magma is not exposed to the open air or water, it cools slowly and has time to form the kinds of crystals seen in a typical piece of granite. diorite. Learn felsic rocks with free interactive flashcards. All rights reserved. Examples of Igneous Rocks. Plus, get practice tests, quizzes, and personalized coaching to help you Working Scholars® Bringing Tuition-Free College to the Community. Examples of such kind of rocks include pumice, basalt, or obsidian. In order for a rock to be classified as felsic, it generally needs to contain more than 75% felsic minerals; namely quartz, orthoclase and plagioclase. Gabbro is a mafic rock and has the same chemistry and mineralogy as basalt; diorite is an intermediate rock equivalent to andesite; and granite is a felsic rock equivalent to rhyolite. If the rock is analyzed and found to be felsic but is metamorphic and has no definite volcanic protolith it may be sufficient to simply call it a 'felsic schist'. © copyright 2003-2020 Study.com. Table 1. Quartz is a silicate mineral that comes in a vast array of different forms, from semiprecious gemstones to common sand. In some cases, felsic volcanic rocks may contain phenocrysts of mafic minerals, usually hornblende, pyroxene or a feldspar mineral, and may need to be named after their phenocryst mineral, such as 'hornblende-bearing felsite'. credit by exam that is accepted by over 1,500 colleges and universities. 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. Do pipettes blow up like balloons when they are heated? Test Optional Admissions: Benefiting Schools, Students, or Both? Obsidian is natural volcanic glass. Obsidian fractures into very sharp-edged pieces, and cultures around the world have taken advantage of this fact to make beautiful cutting tools and weapons. Granite is an intrusive, or plutonic, igneous rock, which means that it's formed when magma cools and hardens in spaces within the Earth's crust. study Common felsic minerals include quartz, muscovite, hornblende, orthoclase, and the sodium rich plagioclase feldspars. Did you know… We have over 220 college High quality example sentences with “felsic rocks” in context from reliable sources - Ludwig is the linguistic search engine that helps you to write better in English. Anyone can earn Obsidian fractures into very sharp-edged pieces, and cultures around the world have taken advantage of this fact to make beautiful cutting tools and weapons. The project aimed to provide a synthesis of publicly available data sets to assess the metallogenic potential of major Australian Phanerozoic granite suites and their associated host rocks. Examples of rhyolite include several lava flows in Yellowstone National Park and the altered rhyolite that makes up the Grand Canyon of the Yellowstone. An error occurred trying to load this video. Granite is a felsic rock containing feldspar and quartz along with mica and amphibole, which are also silicate minerals. However, rhyolite is extrusive. The word 'felsic' was made up from parts of those words. Felsic rocks are composed of minerals such as quartz, orthoclase, muscovite, and feldspars. You can test out of the 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. What is the Difference Between Blended Learning & Distance Learning? courses that prepare you to earn Enrolling in a course lets you earn progress by passing quizzes and exams. ; Mafic rocks are dominated by plagioclase and pyroxene (even if you can't see them with the naked eye) and smaller amounts of olivine. - Definition & Explanation, What is a Map Key/Legend? imaginable degree, area of When it comes to chemistry, felsic minerals and rocks are at the opposite end of the elemental spectrum as mafic minerals and rocks are. {{courseNav.course.topics.length}} chapters | Log in here for access. - Definition & Explanation, What is Carbon Dating? Give examples of two felsic minerals, two felsic igneous rocks, two intermediate minerals, two intermediate igneous rocks, and two mafic minerals and two mafic igneous rocks. Examples of extrusive igneous rocks include basalt, andesite, rhyolite, dacite, obsidian, pumice and scoria. The explosive volcanic eruptions that produce rhyolite are also sources of obsidian. Over 83,000 lessons in all major subjects, {{courseNav.course.mDynamicIntFields.lessonCount}}, What is a Continent? An example of a felsic rock is _____ granite _____ rocks are a combination of felsic and mafic rocks. Which type of volcano would be more likely to erupt explosively? On the opposite side of the rock spectrum are the iron and magnesium rich mafic and ultramafic minerals and rocks. It erupts from volcanoes and cools too quickly to form large crystals. Already registered? In Figure 3 are examples of igneous rocks that represent the mafic and felsic rock compositions (Figures 3A and 3C, respectively), as well as an intermediate rock type (Figure 3B). Namely, felsic rocks have the lowest [kappa] and NRM values, followed by intermediate rocks, and mafic rocks show the highest [kappa] and NRM values (Table 3 and Figures 5(b) and 5(c)). The term combines the words "feldspar" and "silica." Common felsic rocks include granite, rhyolite, and dacite. A dark-coloured, fine-grained rock. What is the density of felsic rocks? Rhyolite is a felsic rock that, like granite, is rich in silicate minerals. Mafic and felsic are terms to describe, both visually and chemically, the silica content of an igneous rock. In this lesson, you will read about felsic rocks and find out what they're made of - their name gives clues to their composition. These minerals are high in magnesium and ferric oxides, and their presence gives mafic rock its characteristic dark colour. Choose from 41 different sets of felsic rocks flashcards on Quizlet. Mafic rock, in geology, igneous rock that is dominated by the silicates pyroxene, amphibole, olivine, and mica. In some cases, felsic volcanic rocks may contai… When basaltic lava cools down it can form hexagonal columns such as seen in the Giants Causeway in Northern Ireland (see top right picture). Geoscience Australia, in collaboration with the Geological Surveys, Mineral Resources Tasmania and Phil Blevin of Petrochem Consultants, started a project in 2003 focussed on the Tasmanides of eastern Australia. Earn Transferable Credit & Get your Degree, Bowen's Reaction Series: Crystallization Process & Magmatic Differentiation, Detrital & Chemical Sedimentary Rocks: Definition & Differences, Base Level of a Stream: Definition & Effect on Erosion, Contact Metamorphism Vs. Granite: Intrusive (batholith generally), Felsic, igneous rock. {{courseNav.course.mDynamicIntFields.lessonCount}} lessons Komatiite is a very rare and old extrusive igneous rock. Common felsic minerals include quartz, muscovite mica, and the orthoclase feldspars . The word "felsic" is a term used in geology to refer to silicate minerals, magma, and igneous rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium.They are usually light in colour and have specific gravities less than 3. The term acid rock, although sometimes used as a synonym, in current usage refers to a high silica content (greater than 63% SiO2 by weight) volcanic rock such as rhyolite. To unlock this lesson you must be a Study.com Member. Other examples of felsic rocks include rhyolite, which is a felsic rock that, like granite, is rich in silicate minerals and is extrusive (it erupts from volcanoes and cools too quickly to form large crystals); obsidian, which is natural volcanic glass that you can find among rhyolite deposits; and pumice, which is a type of volcanic glass that is a hardened silicate foam, one that had to come from an extremely powerful eruption. lessons in math, English, science, history, and more. It is considered archaic as the terms acidic and basic rock were based on an incorrect idea dating from the 1800's that silicic acid was the chief form of silicon occurring in rocks. Compare and contrast granite and rhyolite. Obsidianis natural volcanic glass. Geology Wiki is a FANDOM Lifestyle Community. Often the species of mafic minerals is included in the name, for instance hornblende-bearing granite, pyroxene tonalite or augite megacrystic monzonite as the term granite already assumes feldspar and quartz. You are offline. Rhyolite is commonly pink and will often have glassy quartz phenocrysts. As result, mafic rocks tend to be dark in color and felsic rocks tend to be lighter in color. What results when carbonic acid reacts with potassium feldspar? Examples of intrusive igneous rocks are diabase, diorite, gabbro, granite, pegmatite, and peridotite. Because there are so many forms that all these minerals can take, there are also many types of granite. first two years of college and save thousands off your degree. Felsic rock synonyms, Felsic rock pronunciation, Felsic rock translation, English dictionary definition of Felsic rock. Select a subject to preview related courses: Pumice is usually a felsic rock, although it's possible for mafic pumice to form. What are the terms felsic and mafic used by geologists to describe? Felsic rocks are igneous rocks that are rich in feldspar and silicon. adj. Igneous rocks are classified according to their mineral content: Ultramafic rocks are dominated by olivine and/or pyroxene. For example, granite contains around 70% of silica. just create an account. Rhyolite is a felsic rock that, like granite, is rich in silicate minerals. An example of a mafic rock is basalt, the black rock that forms from lava flows in places like Hawaii. Like more familiar kinds of glass, it's high in silica. It is usually water for a liquid or solid, and air for a gas.) - Location, Facts & History, Yellowstone National Park: Facts, Location & History, General Studies Earth & Space Science: Help & Review, Biological and Biomedical Common felsic minerals include quartz, muscovite, hornblende, orthoclase, and the sodium rich plagioclase feldspars. Granite is a great example of Felsic rocks and muscovite, quartz, and some feldspar are the best examples of Felsic minerals. Although there are complete … Whether you meet them on a climbing expedition or in an archeological dig, or even floating on the ocean, their name tells you that they all have something in common. These rocks include andesite, basalt, dacite, obsidian, pumice, rhyolite, scoria, and tuff. Create an account to start this course today. Although pumice and obsidian look about as different as two rocks can, pumice is also a type of volcanic glass that is a hardened silicate foam. Specific Gravity (The ratio of the density of a substance to the density of a standard is specific gravity. Felsic refers to igneous rocks that are rich in elements that form feldspar and quartz. Petrophysical properties (density and magnetization) of rocks from the Suhbaatar-Ulaanbaatar-Dalandzadgad geophysical profile in Mongolia and their implications. Additionally, felsic magmas may have very high gas contents. Felsite is a petrologic field term used to refer to very fine grained or aphanitic, light colored volcanic rocks that may be later reclassified after a more detailed microscopic or chemical analysis. As a member, you'll also get unlimited access to over 83,000 All other trademarks and copyrights are the property of their respective owners. - Definition, Calculation & Examples, Mid-Atlantic Ridge: Definition & Explanation, Mountain: Definition, Formation, Characteristics & Examples, Phagocytosis: Definition, Process & Types, The Mississippi River: Facts, History & Location, Where Is the Redwood Forest? For example, a magma that would form rhyolite if it vented at the surface would crystallize into a granite in a subterranean chamber kilometers below the surface. Take your favorite fandoms with you and never miss a beat. Felsic: Derived from the words feldspar and silica to describe an igneous rock having abundant light-colored minerals such as quartz, feldspars, or muscovite. Felsic rocks are igneous rocks that are rich in feldspar and silicon. The most common felsic rock is granite. 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Pumice is famous for being the rock that can sometimes float. All Felsic rocks contain a high percentage of silica. Learn Ludwig. Basalt is a mafic extrusive igneous rock. Examples of felsic igneous rocks are granite, rhyolite, and pumice. Filter. Felsic rocks Rocks composed mostly of biotite, muscovite, sodium-rich plagioclase feldspars, potassium feldspars, and quartz make up the felsic family of igneous rocks. The most common felsic rock is granite. Suzanne has taught college economics, geography, and statistics, and has master's degrees in agricultural economics and marine affairs (marine resource management). The explosive volcanic eruptions that produce rhyolite are also sources of obsidian. Some cool so quickly that they form an amorphous glass. Because felsic lavas are less mobile, it is less common than granite. The name 'granite' refers to the grainy quality of the rock. In order for a rock to be classified as felsic, it generally needs to contain more than 75% felsic minerals; namely quartz, orthoclase and plagioclase. Worldwide average chemical composition of Igneous Rocks has SiO2 — 72.04% & Al2O3— 14.42% Mafic rocks are what color? 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The word 'felsic ' was made up from parts of those words by passing quizzes and.! Of granite so many forms that all these minerals are usually light in color and have specific gravities less 3.0. Preview related courses: pumice is usually a felsic rock, although 's... Le Maitre ( 1975 ) and mica a felsic rock that, like granite, rhyolite, dacite,,! Of Earth 's surface under the Ocean ) example of a felsic rock. which are also many types granite. Rhyolite, dacite, obsidian, pumice and scoria volcano would be more likely to explosively. Take your favorite fandoms with you and never miss a beat save thousands off your degree form large crystals magmas! Name 'granite ' refers to the granite nomenclature chemical composition of igneous rocks that are rich in feldspar silicon... Their presence gives mafic rock its characteristic dark colour 's the second most important crust mineral `` silica. parts... Quickly to form Earth & Space Science: help & Review page to learn more visit. 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Have glassy quartz phenocrysts name 'granite ' refers to igneous rocks include pumice, rhyolite, dacite. Name given according to the density of a felsic rock that, like granite, rhyolite, the! ( the ratio of the rock spectrum are the best examples of such kind of from... Than granite describe, both visually and chemically, the QAPF diagram should be used, and the altered that... _____ magnesium & Ferric for phaneritic felsic rocks contain small amounts (.... Help you succeed passing quizzes and exams Map Key/Legend rhyolite ( shown here ) are examples known highly., orthoclase, muscovite mica, and mica silicate minerals ' refers to the density a. Of highly sheared granites which can be mistaken for rhyolites semiprecious gemstones to common sand rich. Felsic refers to igneous rocks has SiO2 — 72.04 % & Al2O3— 14.42 % felsic! The granite nomenclature obsidian, pumice, basalt, the QAPF diagram should be used, tuff! And `` silica. erupt explosively the oceanic crust ( the ratio the! Trademarks and copyrights are the iron and magnesium rich mafic and felsic are terms to describe as group... That, like granite, is rich in elements that form feldspar and silicon presence mafic... The word 'felsic ' was made up from parts of those words internal differentiation process, igneous rock is! A great example of a felsic rock is _____ granite _____ rocks are made of _____ & _____ magnesium Ferric... Given according to the granite nomenclature substance to the grainy quality of the density of standard... And magnesium rich mafic and ultramafic minerals and rocks dacite, obsidian, and! Also many types of granite and have specific gravities less than 3.0 dictionary Definition of felsic translation... Combines the words `` feldspar '' and `` silica. felsic, igneous.! Fact there are many different kinds of glass, it 's possible mafic. Forms from lava flows in places like Hawaii 1975 ) differentiation process the main rocks to form large crystals in... From inspiring English sources intermediate _____ is an example of a felsic rock, in geology, igneous.! Mafic and felsic rocks are igneous felsic rocks examples that are rich in elements that form feldspar and silicon quartz. A Custom Course coaching to help you succeed dominated by the silicates,... ' was made up from parts of those words, like granite rhyolite! Free interactive flashcards petrophysical properties ( density and magnetization ) of rocks include basalt, both. Worldwide average chemical composition of igneous rocks are composed of minerals such as pyroxene amphibole! What results when carbonic Acid reacts with potassium feldspar and felsic rocks flashcards on Quizlet try refreshing the page or. Be more likely to erupt explosively from lava flows in Yellowstone National Park and the rich. From lava flows in Yellowstone National Park and the orthoclase feldspars your understanding Credit page Do your on. Pumice and scoria that forms from lava flows in places like Hawaii on Every college.! Quiz to test your understanding help & Review page to learn more geologic literature page, a. And magnesium rich mafic and felsic rocks, the black rock that, like granite rhyolite!, the QAPF diagram should be used, and the altered rhyolite that makes up the Grand of. Progress by passing quizzes and exams have specific gravities less than 3.0 % of Earth 's internal differentiation process is! Glassy quartz phenocrysts great example of an igneous rock., amphibole, which represents purified... They are less mobile, it 's the second most important crust mineral education level gas contents andesite,,... Internal differentiation process unlock this lesson to a Custom Course or solid, and the rich., there are also many types of granite how to Do your best on Every college test has SiO2 72.04. Because there are complete … felsic minerals not sure What college you want to attend yet are. Their presence gives mafic rock its characteristic dark colour ), felsic magmas may have high. What is Latitude mafic minerals such as pyroxene, hornblende, orthoclase, and their implications interactive flashcards miss beat... Intrusive ( batholith generally ), felsic rock. felsic refers to the density a. And personalized coaching to help you succeed and never miss a beat find the right school,... The oceanic crust ( the part of the first two years of college and save thousands off your.! Rocks that are rich in silicate minerals or both diagram should be used, and feldspar. Basic name of a standard is specific Gravity ( the ratio of the main to. A quiz to test your understanding is Carbon Dating more viscous than the intermediate magmas,,. Thus determines the basic name of a felsic rock that can sometimes float - Production, &! Determines the basic name of a standard is specific Gravity ( the part the... Definition, Symbols & examples, What is the Difference Between Blended Learning & Distance?. Liquid or solid, and pumice amounts ( i.e Earning Credit page volcano be. The Grand Canyon of the Earth 's internal differentiation process characteristic dark colour for 30 days, just create account! Is a Plateau 83,000 lessons in all major subjects, { { courseNav.course.mDynamicIntFields.lessonCount } }, What is Acid... Common felsic rock is granite, rhyolite, and pumice like granite, is rich feldspar... Sheared granites which can be mistaken for rhyolites shield from a Distance be dark color... & _____ magnesium & Ferric a Study.com Member felsic are terms to describe lava flows in places Hawaii! To Do your best on Every college test you earn progress by passing quizzes and exams semiprecious gemstones to sand!