Magnesite vs Sugilite
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Magnesite
Magnesite is a mineral composed primarily of magnesium carbonate, with the chemical formula MgCO3. It commonly occurs in white, grey, or pale brown masses and has a dull to glassy appearance, although some material is cut and polished for ornamental objects and jewellery. Magnesite is also frequently dyed blue and sold as an imitation turquoise, so colour alone is not a reliable way to identify it...
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Sugilite
Sugilite is a rare purple to pink manganese-bearing cyclosilicate mineral, usually found as opaque masses rather than transparent crystals. It was first identified in 1944 on Iwagi Islet, Japan, by petrologist Ken-ichi Sugi and colleagues, and was named for Sugi when formally described in 1976. Gem-quality material associated with the Kalahari Manganese Field in South Africa is used in cabochons,...
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