Tanzanite is a variety of Zoisite named after its country of origin, Tanzania. It was first discovered in 1967 and is still the only place where it can be found. Tanzanite is known for its varying shades of violet; also occurs in brown, pink, greenish and yellow. All these shades may turn to blue upon heat treatment. The results of this treatment are stable. Tanzanite is an attractive stone with a color to match any other.
More info on mining practices @
http://www.irinnews.org/film/Gem-Slaves-view.htm
TANZANIA
Gem Slaves: Tanzanite's child labour
English transcript @ http://newsite.irinnews.org/Report.aspx?ReportId=61004
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