Willemite vs Adamite
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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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Adamite
Adamite is a zinc arsenate hydroxide mineral that commonly forms yellow, yellow-green, or pale green crystals and crusts. It occurs in the oxidized zones of zinc-bearing ore deposits and is valued by mineral collectors for its crystal forms and fluorescence, which can produce bright green colors under ultraviolet light. Manganese-bearing adamite, called manganoadamite, can appear pink or reddish,...
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