Black carborundum grit. Carborundum Grit, with the chemical symbol SiC, is a solid industrial mineral crystalline. It is used as an abrasive, semiconductor, and ceramic,monly referred to as carborundum. SiC exists naturally in a scarce mineral called moissanite. When impurities are added, silicon carbide crystals appear green or black, depending on the contaminant level.
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