Tanzanite is a purplish blue variety of zoisite. Discovered in 1967 in Tanzania, it was introduced to the jewelry world in 1968 as Tanzanite by Tiffany & Co.
|Gemological Information for Tanzanite|
|Color||Blue, Violet, Bluish-Purple|
|Refractive Index||1.691 to 1.700|
|Durability||Fair to Poor|
|Hardness||6 to y|
|Similar Stones||Benitoite, Amethyst|
|Treatments||Heated to Produce Purplish-Blue from gray or brown|
|Country of Origin||Tanzania|
|Warm Soapy Water||Save|
|Chemical Attack||Attacket by Hydrofluoric and Hydrochloric Acids|
|Heat Sensitivity||Fuses under a jeweler's torch|
Gem Reference Guide, Los Angeles: Gemological Institute of America, 1988. Pp. 262-264.
Newman, Harold. An Illustrated Dictionary of Jewelry, New York: Thames and Hudson, 1981. Pp. 300.
Schumann, Walter. Gemstones of the World, New York: Sterling Publishing, Co., 1977. Pp. 160.