Willemite vs Idocrase
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Willemite
Willemite is a zinc silicate mineral with the chemical formula Zn2SiO4 and a minor source of zinc ore. It occurs in several colors and forms, but specimens from the Franklin and Sterling Hill zinc deposits in New Jersey are especially associated with bright green fluorescence under shortwave ultraviolet light. The mineral is named after William I of the Netherlands and is collected both for its mi...
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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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