The chief varieties of sandstone are quartzite, rich in silica; arkose, feldspar-rich; graywacke, coarse-grained and of varied composition; and subgraywacke, with more rounded grains and less feldspar than graywacke. Sandstone grades into conglomerate and shale.
Sandstone beds may contain natural gas and petroleum, and are common aquifers. Sandstone is quarried for building, and crushed for aggregate.
Related category GEOLOGY AND PLANETARY SCIENCE
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