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Tanzanite is one of the more recently discovered gemstones. In July of 1967 a tailor named Manuel d'Souza from the Indian province of Goa prospecting for rubies was led to a deposit of blue stones by Maasai tribesmen. (Granted, this means the Maasai discovered it, but few places or things are considered "discovered" until a foreigner names, promotes and markets them.)
D'Souza initially believed he had stumbled upon sapphire, but found that the material was too soft to be corundum. Laboratory investigation showed that the stone was a previously unseen variety of zoisite, already known in its green form.
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