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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

Other Languages:
Norwegian (Bokmål):Tanzanitt

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:
  • Buy from Dave Bunk Minerals
  • rare and unusual minerals mainly crystallized
  • Buy minerals from YourMineralCollection
  • Tanzanite specimens for sale - minfind.com
  • Buy from David K Joyce minerals
  • The Arkenstone - Fine Minerals
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • SpiriferMinerals.com - high quality low prices
  • Search for Tanzanite on Well-Arranged Molecules
  • Wilensky Fine Minerals
  • Buy rare minerals from Excalibur Minerals
  • Fine and rare minerals from mintreasure.com
  • 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.
    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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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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