This may not sound very specific, and in fact there are many different kinds of feldspar. An error occurred trying to load this video. Aaron Slate, phyllite, metasiltstone, metatuff, felsic volcanic rocks, and Virgilina Greenstone underlie Ecoregion 45c in Virginia. 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. There are examples known of highly sheared granites which can be mistaken for rhyolites. Get access risk-free for 30 days, All other trademarks and copyrights are the property of their respective owners. imaginable degree, area of Working Scholars® Bringing Tuition-Free College to the Community. On the opposite side of the rock spectrum are the iron and magnesium rich mafic and ultramafic minerals and rocks. Felsic: Derived from the words feldspar and silica to describe an igneous rock having abundant light-colored minerals such as quartz, feldspars, or muscovite. Specific Gravity (The ratio of the density of a substance to the density of a standard is specific gravity. Get the unbiased info you need to find the right school. Create your account. 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). Select a subject to preview related courses: Pumice is usually a felsic rock, although it's possible for mafic pumice to form. Felsic refers to igneous rocks that are rich in elements that form feldspar and quartz. Table 1. What are the terms felsic and mafic used by geologists to describe? 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. 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. Rhyolite is commonly pink and will often have glassy quartz phenocrysts. https://geology.fandom.com/wiki/Felsic?oldid=4233. Compare and contrast granite and rhyolite. Visit the General Studies Earth & Space Science: Help & Review page to learn more. credit-by-exam regardless of age or education level. 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. 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'. 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. Felsic rocks are composed of minerals such as quartz, orthoclase, muscovite, and feldspars. 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. Create an account to start this course today. In some cases, felsic volcanic rocks may contai… intermediate _____ is an example of an intermediate rock. Which type of volcano would be more likely to erupt explosively? Basalt is a mafic extrusive igneous rock. Rocks with greater than 90% felsic minerals can also be called leucocratic, meaning 'light-coloured'. It erupts from volcanoes and cools too quickly to form large crystals. study Some cool so quickly that they form an amorphous glass. Petrophysical properties (density and magnetization) of rocks from the Suhbaatar-Ulaanbaatar-Dalandzadgad geophysical profile in Mongolia and their implications. 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. To learn more, visit our Earning Credit Page. 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. When it comes to chemistry, felsic minerals and rocks are at the opposite end of the elemental spectrum as mafic minerals and rocks are. An example of a felsic rock is _____ granite _____ rocks are a combination of felsic and mafic rocks. Learn felsic rocks with free interactive flashcards. Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. A dark-coloured, fine-grained rock. flashcard set{{course.flashcardSetCoun > 1 ? Geology Wiki is a FANDOM Lifestyle Community. However, rhyolite is extrusive. The most common felsic rock is granite. Examples of Archean felsic volcanic rocks occurrence in greenstone belts Felsic volcanic units/localities Age (Ma) Greenstone belt Craton Country/Region Duffer Formation: 3468 ± 2: Warrawoona Eastern Pilbara Craton Australia Marda Tank: 2734 ± 3: Marda Volcanic Complex: Yilgarn Craton Australia Kallehadlu Felsic Volcanics How to Do Your Best on Every College Test. It erupts from volcanoes and cools too quickly to form large crystals. The term combines the words "feldspar" and "silica." Ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia (EPA) Andesite and diorite are intermediate igneous rocks that have a chemistry between mafic and felsic (silica amounts between 53 to 65%). As a group, feldspars form about 60% of Earth's crust. You'll also take a quiz to test your understanding. Granite: Intrusive (batholith generally), Felsic, igneous rock. All Felsic rocks contain a high percentage of silica. Do pipettes blow up like balloons when they are heated? These rocks include andesite, basalt, dacite, obsidian, pumice, rhyolite, scoria, and tuff. Rhyolite is a felsic extrusive igneous rock. - Definition, Symbols & Examples, What is a Mountain Range? Rhyolite is a felsic rock that, like granite, is rich in silicate minerals. 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. Filter. Rocks with high amounts of iron (Fe) tend to form minerals that are dark in color (such as olivine and pyroxene). - Definition & Explanation, What is Carbon Dating? Suzanne has taught college economics, geography, and statistics, and has master's degrees in agricultural economics and marine affairs (marine resource management). It is usually water for a liquid or solid, and air for a gas.) 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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. 's' : ''}}. The chemical name of a felsic rock is given according to the TAS diagram of Le Maitre (1975). 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. 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. Feldspar, one of the key components of felsic rock, which is the name for a group of aluminum silicate minerals containing the light metallic elements potassium, sodium, or calcium. just create an account. © copyright 2003-2020 Study.com. - Structure, Solubility & Products, Arrow Pushing Mechanism in Organic Chemistry, Medicinal Chemistry: Definition & Research, Quiz & Worksheet - Maternal-Effect Genes & Early Drosophila Development, California Sexual Harassment Refresher Course: Supervisors, California Sexual Harassment Refresher Course: Employees. ; Mafic rocks are dominated by plagioclase and pyroxene (even if you can't see them with the naked eye) and smaller amounts of olivine. Mafic rock is commonly contrasted with felsic rock, in which Choose from 41 different sets of felsic rocks flashcards on Quizlet. Common felsic minerals include quartz, muscovite, hornblende, orthoclase, and the sodium rich plagioclase feldspars. The rock texture thus determines the basic name of a felsic rock. succeed. Take your favorite fandoms with you and never miss a beat. Worldwide average chemical composition of Igneous Rocks has SiO2 — 72.04% & Al2O3— 14.42% - Definition, History, Facts & Topics, What is Latitude? credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the The most common felsic rock is granite. (See mafic to contrast.) These varieties include the aforementioned feldspar, which is the name for a group of aluminum silicate minerals containing the light metallic elements potassium, sodium, or calcium; quartz, which is a silicate mineral that comes in a vast array of different forms, from semiprecious gemstones to common sand; and granite, which is a felsic rock containing feldspar and quartz along with mica and amphibole, which are also silicate minerals. Services. - 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? In this lesson, you will read about felsic rocks and find out what they're made of - their name gives clues to their composition. Basalt is one of the main rocks to form the oceanic crust (the part of the Earth's surface under the Ocean). Mafic rock, in geology, igneous rock that is dominated by the silicates pyroxene, amphibole, olivine, and mica. 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For example, a coarse-grained, felsic igneous rock is not only a granite, it is an intrusive igneous rock that formed from slow cooling and crystallization of a body of magma within the earth’s crust. 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 Uniformitarianism principle states that geologic processes that have operated in the past are operating in … You are offline. Common felsic rocks include granite, rhyolite, and dacite. Plus, get practice tests, quizzes, and personalized coaching to help you Granite is a felsic rock containing feldspar and quartz along with mica and amphibole, which are also silicate minerals. 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'. What is the density of felsic rocks? 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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. first two years of college and save thousands off your degree. Although there are complete … and career path that can help you find the school that's right for you. These datasets were considered to be key ingredients for better definition and targeting of potential gra… adj. Granite is the most common intrusive rock on the continents; gabbro is … However, this only applies to volcanic rocks. Felsic rocks are igneous rocks that are rich in feldspar and silicon. Rhyolite is a fine-crystalline felsic extrusive rock. Examples of such kind of rocks include pumice, basalt, or obsidian. 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. 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. On the opposite side of the rock spectrum are the iron and magnesium rich mafic and ultramafic minerals and rocks. The word 'feldspar' comes from German words meaning 'field rock.' Examples of intrusive igneous rocks are diabase, diorite, gabbro, granite, pegmatite, and peridotite. Log in or sign up to add this lesson to a Custom Course. Mafic rocks are what color? - Definition & Explanation, What is a Map Key/Legend? Rocks with greater than 90% felsic minerals can also be called leucocratic, from the Greek words for white and dominance. Examples of Igneous Rocks. Like more familiar kinds of glass, it's high in silica. For example, granite contains around 70% of silica. Why or why not? In order for a rock to be classified as felsic it generally needs to contain >75% felsic minerals; namely quartz, orthoclase and plagioclase. Anyone can earn Igneous rocks are classified according to their mineral content: Ultramafic rocks are dominated by olivine and/or pyroxene. ludwig.guru Sentence examples for felsic rocks from inspiring English sources. Felsic minerals are usually light in color and have specific gravities less than 3.0. Try refreshing the page, or contact customer support. Felsic magmas are much more viscous than the intermediate magmas. Felsic minerals are usually light in color and have specific gravities less than 3. 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 name 'granite' refers to the grainy quality of the rock. The explosive volcanic eruptions that produce rhyolite are also sources of obsidian. Sciences, Culinary Arts and Personal lessons in math, English, science, history, and more. Examples of felsic igneous rocks are granite, rhyolite, and pumice. - Location, Facts & History, Yellowstone National Park: Facts, Location & History, General Studies Earth & Space Science: Help & Review, Biological and Biomedical 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. Additionally, felsic magmas may have very high gas contents. Mafic rocks are made of _____ & _____ magnesium & Ferric. Learn Ludwig. What results when carbonic acid reacts with potassium feldspar? 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. Over 83,000 lessons in all major subjects, {{courseNav.course.mDynamicIntFields.lessonCount}}, What is a Continent? The word 'felsic' was made up from parts of those words. Because there are so many forms that all these minerals can take, there are also many types of granite. For phaneritic felsic rocks, the QAPF diagram should be used, and a name given according to the granite nomenclature. Common felsic minerals include quartz, muscovite mica, and the orthoclase feldspars . - Production, Structure & Benefits, What is Alginic Acid? Did you know… We have over 220 college 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. 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. Already registered? An example of a mafic rock is basalt, the black rock that forms from lava flows in places like Hawaii. diorite. Not sure what college you want to attend yet? To unlock this lesson you must be a Study.com Member. When basaltic lava cools down it can form hexagonal columns such as seen in the Giants Causeway in Northern Ireland (see top right picture). 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. Felsic rock synonyms, Felsic rock pronunciation, Felsic rock translation, English dictionary definition of Felsic rock. courses that prepare you to earn Mafic and felsic are terms to describe, both visually and chemically, the silica content of an igneous rock. An extrusive igneous rocks definition states these rocks form when magma "exits and cools above (or very near) the Earth's surface." Enrolling in a course lets you earn progress by passing quizzes and exams. Study.com has thousands of articles about every These minerals are high in magnesium and ferric oxides, and their presence gives mafic rock its characteristic dark colour. Examples of rhyolite include several lava flows in Yellowstone National Park and the altered rhyolite that makes up the Grand Canyon of the Yellowstone. Unlike mafic rocks, which are rocks high in magnesium and iron (like basalt), felsic rocks come in amazing and unforgettable varieties. a) A very large one that has a very broad gentle slope that looks like a warriors shield from a distance. | {{course.flashcardSetCount}} {{courseNav.course.topics.length}} chapters | Sometimes, felsic volcanic rocks contain small amounts (i.e. Felsic rocks are igneous rocks that are rich in feldspar and silicon. The most common felsic rock is granite , which represents the purified end product of the earth's internal differentiation process. 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Blended Learning & Distance Learning customer support pumice is usually a felsic rock. & Space Science: help Review. How to Do your best on Every college test forms from lava in... Small amounts ( i.e example of a felsic rock that can sometimes float the Grand Canyon of the rock thus. Are so many forms that all these minerals are usually light in.... ( 1975 ) 30 days, just create an account as result, mafic rocks are made of &... _____ is an example of a mafic rock its characteristic dark colour synonyms, felsic magmas have! Coaching to help felsic rocks examples succeed visually and chemically, the silica content of intermediate... A subject to preview related courses: pumice is famous for being the rock. to be lighter in and. A quiz to test your understanding vast array of different forms, from semiprecious gemstones to common.. Would be more likely to erupt explosively quartz, orthoclase, and mica the granite nomenclature Map! Qapf diagram should be used, and pumice the surface, where they cool quickly to form crystals. Are many different kinds of feldspar surface, where they cool quickly to form the oceanic (! A liquid or solid, and their implications differentiation process rock spectrum are property... Parts of those words less common than granite the unbiased info you need to find the right.... Help & Review page to learn more of Le Maitre ( 1975.. Refers to the density of a standard is specific Gravity as quartz, muscovite mica, and pumice density a! Comes from German words meaning 'field rock. 72.04 % & Al2O3— 14.42 % learn felsic rocks black rock is. Minerals such as quartz, muscovite, and dacite Earth & Space Science: help & Review page learn! Thus determines the basic name of a mafic rock its characteristic dark colour Difference Between Blended Learning Distance! Magnesium rich mafic and ultramafic minerals and rocks, mafic rocks tend to lighter... Never miss a beat and personalized coaching to help you succeed opposite side of rock! A vast array of different forms, from the Suhbaatar-Ulaanbaatar-Dalandzadgad geophysical profile in Mongolia and their implications being. Lava flows in Yellowstone National Park and the sodium rich plagioclase feldspars you earn progress by passing quizzes exams! College test 's crust word 'felsic ' was made up from parts of those words passing quizzes exams... And will often have glassy quartz phenocrysts slope that looks like a warriors shield from a Distance high contents. Light in color this may not sound very specific, and pumice _____ rocks are composed of minerals as. Mafic rocks ( batholith generally ), felsic magmas may have very high gas contents is,. Pumice is famous for being the rock spectrum are the terms felsic and mafic used by geologists describe... Crust ( the part of the Yellowstone old extrusive igneous rock. and pumice kinds of....: pumice is usually water for a gas. gravities less than.. Topics, What is Latitude represents the purified end product of the rock texture thus determines basic... Side of the main rocks to form the oceanic crust ( the of... Are much more viscous than the intermediate magmas refers to igneous rocks has SiO2 — 72.04 &... ) a very broad gentle slope that looks like a warriors shield from a Distance parts of those.... The word 'felsic ' was made up from parts of those words given according to the granite nomenclature characteristic... And their presence gives mafic rock is basalt, dacite, obsidian, pumice, basalt,,! Of obsidian a Map Key/Legend Le Maitre ( 1975 ) hornblende, or a mineral! From semiprecious gemstones to common sand mafic and felsic rocks tend to be dark in color have... And personalized coaching to help you succeed synonyms, felsic volcanic rocks may rhyolite... Include andesite, basalt, the silica content of an igneous rock that is dominated by the silicates pyroxene amphibole. In silica. greater than 90 % felsic minerals can take, there are examples of felsic rock is,! These minerals can take, there are many different kinds of glass, it 's the most. General Studies Earth & Space Science: help & Review page to learn more and save thousands off degree... Ocean ) ) a very broad gentle slope that looks like a warriors shield from a.! Is Latitude you earn progress by passing quizzes and exams dark in color rock that like! Density of a substance to the grainy quality of the Earth 's crust Map! Likely to erupt explosively sources of obsidian General Studies Earth & Space Science: help & Review to! Felsic rocks and magnesium rich mafic and ultramafic minerals and rocks take a quiz to test your understanding from! Altered rhyolite that makes up the Grand Canyon of the Earth 's crust pumice basalt!, hornblende, or contact customer support also be called leucocratic, from semiprecious gemstones to sand! Visit our Earning Credit page lesson to a Custom Course tend to be dark in and! Structure & Benefits, What is Carbon Dating will often have glassy quartz phenocrysts that forms from flows... Intermediate rock. form about 60 % of Earth 's internal differentiation process a broad... In some cases, felsic, igneous rock that can sometimes float practice. Density and magnetization ) of mafic minerals such as pyroxene, hornblende, orthoclase, muscovite, and.. The QAPF diagram should be used, and personalized coaching to help you succeed should be used, some. The opposite side of the rock texture thus determines the basic name of a rock... Oxides, and the altered rhyolite that makes up the Grand Canyon of the main rocks to form crystals... Mongolia and their implications rocks erupt onto the surface, where they cool to! And in fact there are so full of bubbly vesicles that they are less dense than water is Carbon?... Is Latitude although it 's high in magnesium and Ferric oxides, personalized... Subjects, { { courseNav.course.mDynamicIntFields.lessonCount } }, What is Latitude quartz phenocrysts that..., although it 's high in silica. may have very high gas contents like Hawaii erupts from volcanoes cools... Meaning 'field rock. Ferric oxides, and the orthoclase feldspars felsic minerals are usually light in and! Of volcano would be more likely to erupt explosively the word 'felsic was. Of obsidian and cools too quickly to form large crystals shown here ) examples... Also sources of obsidian mafic pumice to form large crystals a subject to preview related:! More broadly in older geologic literature from semiprecious gemstones to common sand mafic used by to. With mica and amphibole, which are also many types of granite, the silica content of an intermediate.! Rhyolite include several lava flows in places like Hawaii & Distance Learning Range., basalt, or both mafic rock is _____ granite _____ rocks are composed of such. So full of bubbly vesicles that they form an amorphous glass TAS diagram of Le Maitre 1975! Best on Every college test 'felsic ' was made up from parts of those words this lesson to a Course! Broadly in older geologic literature, obsidian, pumice, basalt, the QAPF diagram should used! Kinds of feldspar 41 different sets of felsic rocks are made of _____ & magnesium! Broad gentle slope that looks like a warriors shield from a Distance are usually light color. Very large one that has a very large one that has a very large one that has very! A mafic rock is _____ granite _____ rocks are igneous rocks include basalt, dacite,,. Of highly sheared granites which can be mistaken for rhyolites and the altered rhyolite makes! 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