Idocrase vs Phenakite
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Idocrase
Idocrase is the traditional name for vesuvianite, a calcium aluminum silicate mineral that commonly forms in skarn and other rocks altered by contact with igneous bodies. It occurs in colors including green, brown, yellow, and blue, and crystals generally have a tetragonal form. Abraham Gottlob Werner recognized and named vesuvianite in 1795 after material from Mount Vesuvius; transparent or well-...
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Phenakite
Phenakite, also spelled phenacite, is a beryllium silicate mineral with the chemical formula Be2SiO4. It commonly forms transparent, colorless crystals but may also appear pale yellow, pink, or brown, and its hardness and relatively high refractive index allow suitable specimens to be cut as gemstones. Notable occurrences include Russia's Ural Mountains and Minas Gerais in Brazil, although fine cr...
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