Carbonado

Black carbonado diamond

Description

A black or dark-color Diamond. Carbonado diamonds have primarily been found in Brazil (Sao Salvador), Bahia, and Borneo. They are usually opaque, granular stones with no distinct cleavage. Carbonado diamonds are used for in Abrasive coatings on drill bits, and grinding wheels. They are also used on rock cutting saws, glass cutters, phonograph needles, hardness testers, semiconductors, and wire-drawing dies.

Synonyms and Related Terms

black diamond; carbons; industrial grade diamond

Physical and Chemical Properties

• No cleavage.
• Slightly porous.

Composition	C
Mohs Hardness	10
Density	3.1-3.3 g/ml

Comparisons

Properties of Common Abrasives

Resources and Citations

• Mineralogy Database: Diamond

• R.M.Organ, Design for Scientific Conservation of Antiquities, Smithsonian Institution, Washington DC, 1968

• Encyclopedia Britannica, http://www.britannica.com Comment: "Carbonado." Accessed: 26 Apr. 2004.

• C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979

• G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 264

• 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