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Definition of sandstone:

  1. A rock made of sand more or less firmly united. Common or siliceous sandstone consists mainly of quartz sand.

Synonyms:

freestone, Potsdam quartzite, Berea sandstone, grit, Medina sandstone, brownstone, Triassic brownstone, flagstone, Old Red Sandstone, New Red Sandstone, novaculite, bluestone.

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