Rock that contains grit or is composed of sandstone; a hard, granular rock used for grinding or polishing.
Compound of 'grit' and 'rock,' referring to stone with a grainy, abrasive texture that makes it useful for grinding or sharpening.
Gritrock was literally the foundation of civilization—ancient cultures treasured deposits of gritrock to make millstones, grinding tools, and whetstones, which determined settlement locations.
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