Maficigneous rocks that contain lots of magnesium and

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Mafic—igneous rocks that contain lots of magnesium and iron rich minerals (olivine,  pyroxene) with plagioclase feldspar, these rocks are usually more dark colored
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Felsic—igneous rocks that contain minerals that contain more silica, potassium and  sodium less calcium, iron and magnesium (orthoclase feldspar, muscovite or biotitie  mica, quartz) these rocks are usually mire light colored Intermediate—have both mafic and felsic components  Names of Igneous Rocks Igneous rocks are subdivided (named) based on texture and composition) Granite—phaneritic texture, felsic composition, slow cooling of granitic (felsic) magma Rhyolite—aphanite texture, felsic composition, fast cooling of granitic (felsic) magma  Gabbro—phaneritic texture, mafic composition, slow cooling of basaltic (mafia) magma Basalt—aphanitic texture, mafic composition, fast cooling of basaltic (mafic) magma Diorite—phaneritic texture, intermediate composition, slow cooling of intermediate  comp. magma Andesite—aphanitic texture, intermediate composition, fast cooling of intermediate  comp. magma Peridotite—phaneritic texture, ultramafic composition, slow cooling of ultra basaltic  magma Basalt Porphyry—porphyritic texture, mixed cooling of a basaltic magma Obsidian—glassy texture instantaneous cooling of magma Vesicular Basalt—vesicular texture, fast cooling of a basaltic magma with gases  escaping
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