Redoubt volcano, Alaska, on 4 March 1990 USGS Cascades Volcano Observatory QUICK ACCESS SELF TEST Alphabetical Listing Bowens Reaction Series Classification Igneous Rock distribution Composition/Texture Key Color/Texture Key OTHER SITES Minerals Sedimentary Rx Metamorphic Rx Plate Tectonic Primer Wilson Cycle Tectonic

Igneous Rock Composition Igneous Rock Composition Igneous rocks are commonly classified by their composition and texture. Most are composed of the eight most abundant elements in the Earths crust. Because of the dominance of oxygen and silicon in the crust, igneous rocks are mostly made up of silicate minerals. These

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School and Library Subscribers JOIN LOGIN Activate Your Free Trial! stories quizzes galleries lists Search Click here to search Igneous rock geology Table of Contents Written By: Richard H. Jahns Albert M. Kudo Last Updated: 2-9-2011 See Article History Related Topics Nicolas Desmarest spherulite dike colour index fel

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      Igneous Rocks by Composition Igneous rocks are classified according to their mineral content: Ultramafic rocks are dominated by olivine and/or pyroxene. Mafic rocks are dominated by plagioclase and pyroxene (even if you cant see them with the naked eye) and smaller amounts of olivine. Intermediate

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Igneous rock (derived from the Latin word ignis meaning fire) is one of the three main rock types , the others being sedimentary and metamorphic . Igneous rock is formed through the cooling and solidification of magma or lava . Igneous rock may form with or without crystallization , either below the surface as intrusiv