is olivine mafic or felsic?
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Most mafic minerals are dark in color, and common rock-forming mafic minerals include olivine, pyroxene, amphibole, and biotite. Common mafic rocks include basalt, diabase and gabbro.
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There are very small differences between the two layers. The upper mantle has Olivine (a very special rock), compounds with silicon dioxide, and a substance called Peridotite. The lower mantle is more solid than the upper mantle.
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['andesite.', 'basalt.', 'dacite.', 'dolerite (also called diabase)', 'gabbro.', 'diorite.', 'peridotite.', 'nepheline.']
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In geology, felsic is an adjective describing igneous rocks that are relatively rich in elements that form feldspar and quartz. ... 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. The most common felsic rock is granite.
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Rocks composed mostly of hornblende and intermediate plagioclase feldspars make up the intermediate family of igneous rocks. Intermediate magmas are somewhat more viscous than the mafic magmas. Additionally, they contain somewhat more gas than do the mafic magmas, but not quite as much as the felsic magmas (see below).
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The Mantles There are very small differences between the two layers. The upper mantle has Olivine (a very special rock), compounds with silicon dioxide, and a substance called Peridotite. The lower mantle is more solid than the upper mantle.
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Notably, Yellowstone demonstrates bimodal volcanism: it alternates between felsic and mafic eruptions. While the hotspot supplies mafic magma from the mantle, melting of continental crust--as well as fractional crystallization during long waits between eruptions--can create felsic magma.
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['Igneous rock.', 'Pumice.', 'Basalt.', 'Perlite.', 'Rhyolite.', 'Obsidian.', 'Trachyte.', 'Phonolite.']
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The composition of magma that erupts at composite volcanoes is usually felsic (rhyolite) or intermediate (andesite). Composite volcanoes are common along convergent plate boundaries. When a tectonic plate subducts, it melts. This creates the thick magma needed for these eruptions.
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Another kind of extrusive rock is pumice. ... Some pumice will float in water. Obsidian is also an extrusive igneous rock. Obsidian cools so rapidly that it has no crystals.
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Igneous rocks form when magma (molten rock) cools and crystallizes, either at volcanoes on the surface of the Earth or while the melted rock is still inside the crust.
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Felsic rocks are mostly feldspar (especially K-feldspar), at least 10% quartz, and less than 15% mafic minerals (biotite, hornblende).
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Amongst igneous rocks, mafic rocks contain the high-density minerals pyroxene and olivine, and are thus more dense than felsic rocks which contain more of the lower-density minerals quartz and feldspar. ... Clay can absorb substantial amount of water, swelling in volume while also increasing in density.
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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. 6. Mafic rocks are darker in color than felsic rocks.
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Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Some cool so quickly that they form an amorphous glass. These rocks include andesite, basalt, dacite, obsidian, pumice, rhyolite, scoria, and tuff.
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The dark silicates are also called ferromagnesian because of the presence of iron and magnesium in them. They include olivine, pyroxene, amphibole and biotite. The light-colored silicates include quartz, muscovite and feldspar.
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DIORITE - phaneritic rock (large crystals) of both mafic and felsic minerals. ANDESITE - aphanitic rock (small crystals) of both mafic and felsic minerals.