Black diamond

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  1. A variety of crystalline carbon, related to diamond, but showing no crystal form. Highly prized as an abrasive because of its hardness. Occurs only in Brazil. Syn: carbonado
  2. A term frequently applied to coal.
  3. A black gem diamond.
  4. Dense black hematite that takes a polish like metal.

Source: Dictionary of Mining, Mineral, and Related Terms

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