Tanzanite

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Tanzanite bracelet

Description

Tanzanite stone

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.)

Physical and Chemical Properties

  • Pleochroic.
  • Fracture = uneven.
  • Streak = white
  • Mohs Hardness = 6.0 - 6.5
  • Density = 3.2-3.4 g/ml

Comparisons

Properties of Common Gemstones

Resources and Citations

  • R.F.Symmes, T.T.Harding, Paul Taylor, Rocks, Fossils and Gems, DK Publishing, Inc., New York City, 1997
  • C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
  • 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

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