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Tanzanite

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A variety of Zoisite

A gem variety of Zoisite with a blue to blue-violet colour.

Note that a significant percentage of tanzanite crystals on the market have been heat-treated (400-500°C) to produce or enhance this colour, many are originally brown or pale grey. A red tint seen looking down the c-axis is a good indication that the crystal colouration is natural. Note also that tanzanion is used as a synthetic simulant for tanzanite.

First reported from the Merelani Hills (Mererani), Umba Valley, Lelatema Mts, Arusha Region, Tanzania.



Visit gemdat.org for gemological information about Tanzanite. Currently in public beta-test.

Classification of Tanzanite

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Other Names for Tanzanite

Synonyms:
Tanjeloffite
Other Languages:
Dutch:Tanzaniet
Finnish:Tansaniitti
French:Tanzanite
German:Tansanit
Tanjeloffit
Tanzanit
Hebrew:טנזניט
Japanese:タンザナイト
Lithuanian:Tanzanitas
Norwegian (Bokmål):Tanzanitt
Polish:Tanzanit
Portuguese:Tanzanite
Spanish:Tanzanita
Tanjeloffita
Swahili:Tanzanaiti
Swedish:Tanzanit

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Tanzanite

Reference List:

- +
Hurlbut, C.S., Jr. (1969): Gem Zoisite from Tanzania. American Mineralogist 54, 702ff.

Internet Links for Tanzanite

Search Engines:
  • Look for Tanzanite on Google
  • Look for Tanzanite images on Google
  • Mineral Dealers:
  • Fine Minerals from Weinrich Minerals, Inc.
  • Wilensky Fine Minerals
  • Buy fine minerals and gemstones from Pala International
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Rare and Unusual minerals at Mineralogical Research Company
  • High-end worldwide specimens & outstanding customer service
  • Fine and rare minerals from mintreasure.com
  • Buy from David K Joyce minerals
  • Fabre Minerals - search for Tanzanite specimens
  • Buy minerals from YourMineralCollection
  • Buy from McDougall Minerals
  • Find Tanzanite on www.crystalclassics.co.uk
  • Specimens:The following Tanzanite specimens are currently listed for sale on minfind.com.

    Localities for Tanzanite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Tanzania
     
    No reference listed
    • Manyara Region
      • Simanjiro District
        • Lelatema Mts
          • Merelani Hills (Mererani)
    Wilson, W.E., Saul, J.M. Pardieu, V. & Hughes R.W. (2009): Famous Mineral Localities. The Merelani Tanzanite Mines, Lelatema Mountains, Arusha Region, Tanzania. Mineralogical Record, 40: 347-408.
    Wilson, W.E., Saul, J.M. Pardieu, V. & Hughes R.W. (2009): Famous Mineral Localities. The Merelani Tanzanite Mines, Lelatema Mountains, Arusha Region, Tanzania. Mineralogical Record, 40: 347-408.
    Min Rec (2009) 40:347-408
    Olivier, Bernard (2008): The geology and petrology of the Merelani tanzanite deposit, NE Tanzania. Doctoral thesis, University of Stellenbosch, South Africa.
    Andy Seibel
    Natural HistoryMuseum of Los Angeles Co.specimen catalogue No. 41249.
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