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Gritstone
Gritstone is a sedimentary rock composed of coarse sand grains and is a coarser version of sandstone.
Gritstone is usually laid down in water and frequently shows signs of cross bedding[?] or current bedding[?].
It is quarried for building materials. Peak District Gritstone was used for grinding wheels in the cutlery[?] industry. This gives rise to it's other name of Millstone Grit.
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