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countable and uncountable, plural gritstones
A form of sedimentary rock, similar to sandstone but coarser. quotations examples
Adjacent to the roundhouse, but a little further north towards Curzon Street, are the surprising remains of the wagon turntables for the goods shed. Unusually, these are made out of solid gritstone so survive pretty much intact.
2020 April 8, Paul Bigland, “Rail's future revealing railway's past”, in Rail, page 38