Black granite

In the construction industry, black rocks that share the hardness and strength of granitic rocks are known as black granite. In geological terms, black granite might be gabbro, diabase, basalt, diorite, norite, or anorthosite.[1]

References
  1. Morales Demarco, Manuela; Oyhantçabal, Pedro; Stein, Karl-Jochen; Siegesmund, Siegfried (2011). "Black dimensional stones: geology, technical properties and deposit characterization of the dolerites from Uruguay". Environmental Earth Sciences. 63 (7): 1879–1909. doi:10.1007/s12665-010-0827-5.


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