Bort
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Look up bort in Wiktionary, the free dictionary. |
File:Diamond-270244.jpg
A mixture of bort and gem diamonds (larger inclusions) from the Crater of Diamonds State Park
File:Diamant.jpg
Bort-like heavily twinned diamond from Congo
Bort or boart is a 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/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]
See also
References
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Wikisource has the text of the 1911 Encyclopædia Britannica article Bort. |
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ industrial diamond. Encyclopædia Britannica
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