Turquoise vs Tanzanite
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Turquoise
Turquoise is an opaque blue-to-green mineral and a hydrated phosphate of copper and aluminium. It has been used as an ornamental stone and jewelry material for thousands of years, and deposits in the southwestern United States have a long history of mining, trade, and use in Native American arts. The mineral's color can range from blue through green depending on its composition and formation condi...
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Tanzanite
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 strongly pleochroic, displaying different colors from different crystal directions, and much commercial...
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