Difference between revisions of "Tanzanite"
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== Authority == | == Authority == | ||
| − | * | + | * R.F.Symmes, T.T.Harding, Paul Taylor, ''Rocks, Fossils and Gems'', DK Publishing, Inc., New York City, 1997 |
| − | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "tanzanite" | + | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "tanzanite" Encyclopædia Britannica Premium Service. [Accessed 28 Sept. 2005]. |
| − | * | + | * C.W.Chesterman, K.E.Lowe, ''Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf, New York, 1979 |
* Wikipedia, the free encyclopedia, at http://www.wikipedia.com Comment: http://en.wikipedia.org/wiki/Tanzanite (Accessed Sept. 28, 2005) | * Wikipedia, the free encyclopedia, at http://www.wikipedia.com Comment: http://en.wikipedia.org/wiki/Tanzanite (Accessed Sept. 28, 2005) | ||
| − | * | + | * 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 | * ''The American Heritage Dictionary'' or ''Encarta'', via Microsoft Bookshelf 98, Microsoft Corp., 1998 | ||
Revision as of 07:42, 24 July 2013
Description
A pale-color transparent mineral that has been used as a gemstone. Tanzanite is a variety of zoisite composed of calcium aluminum silicate. Blue gem-quality stones were discovered in Tanzania in 1967. Tanzanite may be colorless, yellow-green, brown or bluish purple and refract flashes of blue, magenta and yellow. Most crystals are greenish gray and contain traces of vanadium. These stones are commonly heat treated (600-700C) to produce a strong sapphire blue color gem.
Synonyms and Related Terms
zoisite; Tansanit (Deut.); tanzanita (Esp.); tanzanite (Fr.)
Other Properties
Pleochroic. Fracture = uneven. Streak = white
| Mohs Hardness | 6.0 - 6.5 |
|---|---|
| Density | 3.2-3.4 |
Additional Information
Mineralogy Database: Zoisite
Comparisons
Properties of Common Gemstones
Authority
- R.F.Symmes, T.T.Harding, Paul Taylor, Rocks, Fossils and Gems, DK Publishing, Inc., New York City, 1997
- Encyclopedia Britannica, http://www.britannica.com Comment: "tanzanite" Encyclopædia Britannica Premium Service. [Accessed 28 Sept. 2005].
- C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
- Wikipedia, the free encyclopedia, at http://www.wikipedia.com Comment: http://en.wikipedia.org/wiki/Tanzanite (Accessed Sept. 28, 2005)
- 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