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Tanzanite

This page kindly sponsored by Lapigems Tanzanite Company
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.

Classification of Tanzanite

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Other Names for Tanzanite

Name in Other Languages:
Dutch:Tanzaniet
Finnish:Tansaniitti
French:Tanzanite
Lithuanian:Tanzanitas
Norwegian (Bokmål):Tanzanitt
Polish:Tanzanit
Portuguese:Tanzanite
Swahili:Tanzanaiti
Swedish:Tanzanit

Other Information

Health Risks:
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

Specimens:
The following Tanzanite specimens are currently listed for sale on minfind.com.

Localities for Tanzanite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Mineral and/or Locality  
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