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a. In British usage, any of various hard, coarse, rubbly, or shelly rocks
that weather with a rough irregular surface; e.g. a flaggy sandstone or
limestone used as a building stone. The term appears in certain British
stratigraphic names, as the Kentish Rag (a Cretaceous sandy limestone in
East Kent). Syn: ragstone
b. Any of various hard rocks, as a quartzose mica schist used for
whetstones or a hard limestone used in building. Webster 3rd
c. A large roofing slate left rough on one side. Webster 3rd
d. To break (ore) into lumps for sorting; to cut or dress roughly (as a
grindstone). Webster 3rd
Source:
Dictionary of Mining, Mineral, and Related Terms
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