This article is about the mineral or gem. For other uses, see Bort (disambiguation).
"Boart" redirects here. For the mineral exploration company, see Boart Longyear.
Bort (also boort or boart)
A mixture of bort and gem diamonds (larger inclusions) from the Crater of Diamonds State Park
General
Category
Mineral variety
Formula (repeating unit)
C
Identification
Color
varies (white to yellowish in powder form, yellow to brownish in larger shards)
Use/purpose
Diamond industry
Abrasive
Polishing
Lubricant (as oil additive)
Major varieties
Similar occurrences
Diamond
Ballas
Graphite
Carbon
Carbonado
Coal
Bort, boart, or boort is an umbrella term used in the diamond industry to refer to shards of non-gem-grade/quality diamonds. In the manufacturing and heavy industries, "bort" is used to describe dark, imperfectly formed or crystallized diamonds of varying levels of opacity. The lowest grade, "crushing bort", is crushed by steel mortars and used to make industrial-grade abrasive grits. Small bort crystals are used in drill bits. The Democratic Republic of the Congo provides 75% of the world supply of crushing bort.[1][2][3]
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