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Small, granular, poorly crystallized pieces of diamond. Bort is a gray to black massive stone with numerous flaws, inclusions and impurities. It is primarily obtained from Congo (Kinasha). Bort is used used as in abrasive coatings for drill bits, grinding wheels, and polishing emulsions.

Synonyms and Related Terms

boart; crushed diamond; industrial grade diamond

Other Properties

no distinct cleavage

Composition C
Mohs Hardness 10
Density 3.5


Properties of Common Abrasives

Sources Checked for Data in Record

  • R.M.Organ, Design for Scientific Conservation of Antiquities, Smithsonian Institution, Washington DC, 1968
  • Encyclopedia Britannica, Comment: "Bort." Encyclopædia Britannica. 2004. Encyclopædia Britannica Premium Service. 12 May 2004 .
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998