Arenite is a sandy sedimentary rock composed of eroded fragments of pre- existing rocks. The individual particles are of about the same size as sand grains, thus they include grits and siltstones as well as sandstones. Rocks of this type can be of marine, fresh-water, terrestrial, or glacial origin. Quartz sandstone is the most common type, and the terms ‘arenite’ and ‘ sandstone’ are often used interchangeably. Special types of arenaceous rocks include greywackes, greensands, and arkoses.
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