Bort 1173544 222604976 2008-06-30T06:03:57Z Jackie 7370508 wiki {{otheruses}} '''Bort''' or '''boart''' is a term used in the [[diamond]] industry to refer to shards of [[Gemstone|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 [[mortar and pestle|mortar]]s and used to make industrial-grade [[abrasive]] grits. Small bort crystals are used in [[drill bit]]s. The [[Democratic Republic of the Congo]] provides 75% of the world supply of crushing bort. ==References== * [http://www.idai.org/idaibulletin/edited/diamonds.htm] accessed 20 Mar 2005 {{mineral-stub}} [[Category:Diamond]] [[lv:Borts (minerāls)]] [[pl:Bort]] [[ru:Борт (алмаз)]] [[uk:Борт (мінералогія)]]