Rocks: Igneous, Metamorphic and Sedimentary GeologyPhotographs and information for a large collection of igneous, metamorphic and sedimentary rocks. Geology.comMetamorphic Rocks · Sedimentary

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Sandstone WikipediaMost sandstone is composed of quartz or feldspar because these are the most common minerals in the Earth's crust. Like sand, sandstone may be any color, but the most common c