Sandstone Mesas with Rainbow, Utah

Sandstone Mesas with Rainbow, Utah

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Credit: DAVID PARKER/SCIENCE PHOTO LIBRARY

Caption: The formation of sandstone involves two principal stages. First, a layer or layers of sand accumulates as the result of sedimentation, either from water (as in a stream, lake, or sea) or from air (as in a desert). Typically, sedimentation occurs by the sand settling out from suspension; i.e., ceasing to be rolled or bounced along the bottom of a body of water or ground surface. Finally, once accumulated, the sand becomes sandstone when it is compacted by pressure of overlying deposits and cemented by the precipitation of minerals within the pore spaces between sand grains. Colours will usually be tan or yellow (from a blend of the clear quartz with the dark amber feldspar content of the sand). A predominant additional colourant in the southwestern United States is iron oxide, which imparts reddish tints ranging from pink to dark red, with additional manganese imparting a purplish hue.

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Keywords: colour, deposition, deposits, desert, double rainbow, feldspar, ground, iron, iron oxide, lake, manganese, pressure, quartz, rainbow, refraction, river, sand, sand grains, sandstone, sea, sedimentation water, spectrum, suspension

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