Car·bo·run·dum /ˌkɑrbəˈrʌndəm/
碳化矽,金剛矽
Car·bo·run·dum A beautiful crystalline compound, silicon carbide (SiC), consisting of carbon and silicon in combination; -- also called carbon silicide. It is made by heating carbon and sand together in an electric furnace. The commercial article is dark-colored and iridescent. It is harder than emery, and is used as an abrasive.
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carborundum
n : an abrasive composed of silicon carbide crystals