tanzanite

(from the article `zoisite`) ...limestone. Occurrences include Italy, Germany, Switzerland, Mexico, Scotland, and the United States (Massachusetts). Thulite, a manganous variety ...
Found on http://www.britannica.com/eb/a-z/t/11

tanzanite

tanzanite (tănzăn'īt) , beautiful gemstone discovered in 1967 in the Umba Valley near the Usambara Mts. in Tanzania, a precious variety of the mineral zoisite, a calcium aluminum silicate. Zoisite is a common rock-forming mineral and is usually white to gray in color. Tanzanite...
Found on http://www.infoplease.com/ce6/sci/A0847818.html

Tanzanite

Tanzanite is the blue/purple variety of the mineral zoisite (a calcium aluminium hydroxyl Sorosilicate) belonging to the epidote group. It was discovered in the Mererani Hills of Manyara Region in Northern Tanzania in 1967, near the city of Arusha and Mount Kilimanjaro. Tanzanite is used as a gemstone, and naturally-formed tanzanite is extremely r...
Found on http://en.wikipedia.org/wiki/Tanzanite

Tanzanite

Tanzanite is a blue variety of the zoisite mineral and is a relatively new discovery being found in the 1980's in the only place that it is known to exist, Tanzania. The world famous Jewellery Company Tiffanys named and has promoted this gemstone since its discovery.
Found on http://www.studiojewellery.com.au/jewellery-glossary-t.html
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