'Graywacke, New York State'

'Graywacke, New York State'

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Credit: JOEL AREM/SCIENCE PHOTO LIBRARY

Caption: Graywacke (or greywacke) is an old term describing a dark colored gritty sandstone, usually cemented with abundant clay minerals and silica. Graywacke is characterized by a range in constituent grain sizes, but invariably set into a hard, compact matrix. Many graywackes are associated with old formations that have been deeply buried.

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Keywords: arem collection, clay, clay minerals, formations, geologic feature, geological, geology, grain size, grains, graywacke, greywacke, gritty, gritty sandstone, mineralogy, properties, rock, rocks, sandstone, sedimentary, silica, specimen, texture

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