| http://www.w3.org/ns/prov#value | - Some use limestone, which is a sedimentary rock composed mostly of CaCO3, but can also contain extraneous substances, some that can be harmful, similarly, 'dolomite' is also used to describe dolostone, a sedimentary rock (one composed mostly of the mineral dolomite), but should not be confused with the mineral as it is not just CaMg(CO3)2.
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