Small, imperfectly crystallized pieces of diamond. Ballas stones are rounded with no distinct cleavage. They are extremely hard and tough. Ballas is mined in Brazil and South Africa. The industrial grade diamond is primarily used as an abrasive.
Synonyms and Related Terms
shot bort; industrial grade diamond
Sources Checked for Data in Record
- Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
- Encyclopedia Britannica, http://www.britannica.com Comment: "industrial diamond" Encyclopædia Britannica [Accessed March 4, 2002].