A hard, fine-grained sandstone used historically for sharpening tools, grinding grain, and construction.
Compound of 'grit' and 'stone,' referring to the grainy texture of this sandstone that made it ideal for abrading and grinding tasks.
The Peak District in England has been mined for gritstone for centuries—British climbers literally named a rock climbing grade after 'gritstone' because so many challenging crags are made from it.
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