Before cooling, felsic magmas have a very high viscosity. Sodium and potassium oxides account for approximately 10% of felsic magmas by mass, but only 5% of mafic magmas. Key minerals in felsic rocks are sodium and potassium feldspars, quartz, feldspathoids, and muscovite. Granites are intrusive felsic rocks (from the Latin “granum” means “grain”) usually hypidiomorphic (greater ... is partially ganitized with mineral aggregates of potassium feldspar, quartz, biotite and amphiboles, Aswan quarry, south-central Egypt. Which igneous rock has a vesicular texture and contains the minerals potassium Igneous rocks are formed by the cooling and crystallization of magma. A. granite B. rhyolite C. gabbro D. basalt 5. felsic (comparative more felsic, superlative most felsic) Enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. Intermediate rocks are composed of the minerals amphibole and feldspar and contain a combination of light and dark minerals. Which intrusive igneous rock could be composed of approximately 60% pyroxene, 25% plagioclase feldspar, 10% olivine, and 5% amphibole? other textures: glassy (obsidian), scoria, vesicular. You can also expect to see quartz, muscovite, potassium feldspar, and maybe a little biotite and Na-rich plagioclase in a felsic (or silicic) rock such as granite or rhyolite. According to Bowen's reaction series, which three minerals tend to dominate mafic rocks, and which one of these minerals is not a mafic mineral? Felsic rocks are typically composed of feldspar quartz light minerals mica and from APSC 151 at Queens University 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.The term combines the words "feldspar" and "silica. Within the potassium feldspar group, the occurrence of each potassium feldspar member varies slightly. Felsic minerals are typically light in color (commonly clear, white, or pink) and rich in lighter elements, like silicon, oxygen, aluminum, sodium, and potassium. Dominate mafic rocks: olivine, pyroxene (augite), plagioclase feldspar (Ca rich) Not mafic: plagioclase feldspar. Page | 181 INTRODUCTORY GEOLOGY IGNEOUS ROCKS sibly some olivine or amphibole may be present in a mafic rock such as gabbro or basalt. [ fɛlsɪk] adjective Geology relating to or denoting a group of light coloured minerals including feldspar, quartz, and muscovite. More on igneous rocks... Sedimentary Rocks. 1912, from FELDSPAR (Cf. 45-55%) while felsic is the one with a greater silica content (approx.70-90%). felsic Mafic melts don’t have enough silica to crystallize potassium feldspar, quartz, etc. There in the hardened lava is basalt, one of the world's most common igneous rocks. Often contrasted with mafic. Blend of feldspar + silica, with the suffix -ic. In addition to silicon, felsic lavas also contain other light elements, such as oxygen, sodium, potassium and aluminum. Imagine standing at the base of the Kilauea Volcano. Dense rock with a phaneritic texture. However, not all of these minerals will be crystallised together in the same rock. Compared to felsic igneous rocks, ma c igneous rocks contain greater amounts of A. white quartz B. aluminum C. pink feldspar D. iron 4. Felsic igneous rocks are silica rich and contain abundant potassium feldspar and quartz. The term comes from FEL for feldspar (in this case the potassium-rich variety) and SIC, which indicates the higher percentage of silica. So, based on colour alone, we’ve been able to start classifying the igneous rocks. ultramafic. Potassium feldspar is commonly found in large amounts in felsic … Hardened lava flow covers the land around it. 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. mafic. Felsic igneous rocks are light in color. Felsic rocks Rocks composed mostly of biotite, muscovite, sodium-rich plagioclase feldspars, potassium feldspars, and quartz make up the felsic family of igneous rocks. Orthoclase is the most common potassium feldspar, forming the majority of potassium feldspar found in felsic plutonic igneous rocks, some high temperature veins, and higher-grade metamorphic rocks. The compositions of typical mafic, intermediate, and felsic magmas are shown in Figure 3.3.4. felsic: potassium feldspar, quartz, mica, Na-feldspar. Average felsic  magmas (Figure 7.10, right) are closer to 75% SiO 2 by mass, and have approximately 5% iron, magnesium, and calcium oxides. (felsic, intermediate, mafic, or ultramatic) The large pink minerals in the rock are (olivine, pyroxene, hornblende, quartz.plagioclase feldspar, potassium feldspar) The rock formed in an environment. Since igneous rocks are characterised by silica content in them, mafic is the one with less silica content (approx. mafic magmas will begin crystallizing olivine and continue with pyroxenes and calcium rich plagioclase feldspar. Adjective describing a silicate mineral or igneous rock that is rich in magnesium and iron, and is thus a portmanteau of magnesium and ferric. silica) + ic. In comparison with mafic rocks, felsic rocks are much lighter and as a result “float” higher in the lithosphere then mafic rocks. Adjective . The difference between Mafic and Felsic rocks are the silica content present. "Felsic minerals are usually light in color and have specific gravities less than 3. This is a pure white feldspar that contains less than 10% anorthite. Both felsic and mafic igneous rocks can contain feldspar minerals. Note that, unlike Figure 3.2.1, these compositions are expressed in terms of “oxides” (e.g., Al 2 O 3 rather than just Al). Etymology dictionary. A classic example of a felsic igneous rock is granite, which is mainly composed of quartz (SiO2) and feldspar (potassium-rich and sodium-calcium rich varieties exist) with minor amounts of other minerals (biotite or amphibole). Felsic, on the other hand, is used for silicate minerals, magmas, and rocks which have a lower percentage of the heavier elements, and are correspondingly enriched in the lighter elements, such as silicon and oxygen, aluminum, and potassium. A more detailed identification chart based on felsic / mafic mineral composition Bowen's Reaction Series can be thought of as an idealized order of crystallization of a cooling magma. Felsic igneous rocks (the lightest in color) are comprised mostly of quartz and potassium feldspar. Mafic igneous rocks are iron and magnesium rich and contain abundant pyroxene, and calcium rich plagioclase feldspar. These are your dark green, brown, red, gray and black igneous rocks. intermediate. Another is anorthite feldspar, which is the calcium endmember. Mafic lava, before cooling, has a low viscosity, in comparison with felsic lava, due to the lower silica content in mafic magma. Anorthite is found in mafic igneous rocks and is most common on the moon, but rarely found on Earth. Extrusive Igneous Rocks. silicic or felsic rocks (“fel” from feldspar, and “sic” from silica-rich quartz). These types of rocks are generally light colors as well. Type of color % of Dark Minerals: Composition: Example Image: Mafic >40% dark minerals: No quartz or potassium feldspar is found. Well that somewhat depends on what kind of igneous rock we are talking about. Below is a table with examples of each color of igneous rock. Igneous rocks are classified based on only 4 colors: mafic, ultramafic, felsic, and intermediate. is a term used in geology to refer to silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. Indeed, the term felsic is a mnemonic, based on this mineralogy, formed from (fe) for feldspar, (l) for lenad (a.k.a. The temperature of cooling determines which types of minerals are found in the rock and helps scientists classify the rock as felsic, intermediate or mafic. Is the mantle mafic or felsic? Felsic melts don't have enough iron, magnesium, and calcium to form olivine, pyroxene, or calcium plagioclase. Origin early 20th cent. Mafic: Felsic: Definition: It is relating to, denoting, or containing a group of dark-colored, mainly ferromagnetic minerals such as pyroxene and olivine. The first-formed minerals in a felsic melt are amphiboles (hornblende) or biotite mica, along with some intermediate or sodium plagioclase. Felsic magmas are very light colored because they contain 0 to 15% mafic crystals. Figure 3.2 shows examples of igneous rocks representing mafic and felsic rock compositions (Figures 3.2A and 3.2C, respectively), as well as an Additionally, felsic magmas may have very high gas contents. Wikipedia. potassium feldspar (k-spar): perthite (wavy lines) ... felsic. Generally speaking, more mafic magmas, such as those that form basalt, are hotter and less viscous than more silica-rich magmas, such as those that form rhyolite. : from feldspar + … feldspar) + SILICA (Cf. In geology, felsic is an adjective describing igneous rocks that are relatively rich in elements that form feldspar and quartz. Sign up to receive the latest and greatest articles from our site automatically each week (give or take)...right to your inbox. Felsic minerals are… The term combines the words feldspar and silica. Courtesy of the USGS : Basalt is a black volcanic rock that forms when lava cools on the surface. Felsic igneous rock and a type of granite rich in the mineral potassium feldspar . Felsic magmas are much more viscous than the intermediate magmas. Mafic. (extrusive or intrusive) The name of this rock is 00 10:01 PM 90200 The photo and short video below show a hand sample of an igneous rock.
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