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Tanzanite is the blue-to-violet gem variety of zoisite, a calcium aluminium silicate mineral. It was identified as a commercial gemstone in 1967 and is mined in a restricted area of northern Tanzania near Mount Kilimanjaro, giving the material its name and limited geographic source. Tanzanite is str...
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Thulite is a pink to reddish variety of zoisite colored mainly by manganese. Zoisite is a calcium aluminum hydroxy-silicate mineral, and thulite is valued as an ornamental and lapidary material because of its opaque color and ability to take a polish. It is strongly associated with Norway, where imp...
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