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This abrasive is the densest form of crystallized carbon, the hardest
substance known. It occurs most commonly as well-developed crystals in
volcanic pipes or in alluvial deposits. Bort (boart or borts) sometimes
refers to all diamonds not suitable for gems, or it may refer to
off-color, flawed, or impure diamonds not fit for use for gems or most
other industrial applications, but suitable for the preparation of diamond
grain and powder for use in lapping or the manufacture of most diamond
grinding wheels. This type of bort is also called crushing bort or
fragmented bort. ACSG, 2
Source:
Dictionary of Mining, Mineral, and Related Terms
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