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Dolerite is very rough.
Dolerite is coarse grained variety of basalt, if present in the dorm of a dyke (discordent igneous body), it is called a dolerite dyke.
Yes, it can be.
Dolerite also called "Rowley Rag" can be found in Rowley Regis,West Midlands,England.
It wuz used for pounding into a rock. the dolerite ball was very. very hard.