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igneous rock |
Also found in: Wikipedia, Hutchinson | 0.02 sec. |
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igneous rock: see rock rock, aggregation of solid matter composed of one or more of the minerals forming the earth's crust. The scientific study of rocks is called petrology. Rocks are commonly divided, according to their origin, into three major classes—igneous, sedimentary, and ..... Click the link for more information. . igneous rockAny of various crystalline or glassy, noncrystalline rocks formed by the cooling and solidification of molten earth material (magma). Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary rocks. Though they vary widely in composition, most igneous rocks consist of quartz, feldspars, pyroxenes, amphiboles, micas, olivines, nepheline, leucite, and apatite. They may be classified as intrusive or extrusive rocks. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Now some enterprising junior miners probing those mineral-rich igneous rocks are finding encouraging signs of base metal mineralization. Dispute: Rocks that form from the cooling of magma are called igneous rocks Sedimentary rocks form when particles of other rocks and the remains of plants and animals become cemented together underground The World According To Rock is a unique picture book-style presentation surveying the many types of rock ranging from dirt rocks, to Sedimentary Rocks, to shale, clay, travertine, chalk, crystalline rocks, igneous rocks, and more. |
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