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Folding Commercial Use2
Jul 06, 2017
According to the American Association of Materials testing, granite is divided into common granite and black granite. Ordinary granite by quartz, feldspar, marble and other components, and because of the non-ferrous minerals and black or dark green, the whole is often affected by the long stone color. Black granite dark green or Black rock, from Plagioclase, amphibole, olivine, such as rock formation, so black granite is divided into dirt rock, diabase, basalt and other three kinds.