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willemite
Willemite is a zinc silicate mineral (Zn2SiO4) and a minor ore of zinc. It is highly fluorescent (green) under shortwave ultraviolet light.
It occurs in all different colors in daylight, in fibrous masses, solid brown masses ("troostite"), and apple green gemmy masses.
It was discovered in 1830 and named after William I of the Netherlands.〔
==Formation and associated minerals==
Willemite is usually formed as an alteration of previously existing sphalerite ore bodies, and is usually associated with limestone. It is also found in marble and may be the result of a metamorphism of earlier hemimorphite or smithsonite.〔Klein, Cornelis (2007). ''The Manual of Mineral Science'', p.484. John Wiley and Sons, Inc., Hoboken. ISBN 9780471721574.〕 It occurs in many places, but is best known from Arizona and the zinc, iron, manganese deposits at Franklin and Sterling Hill Mines in New Jersey. It often occurs with red zincite (zinc oxide) and franklinite (Fe,Mn,Zn)(Fe,Mn)2O4 (an iron rich zinc mineral occurring in sharp black isometric octahedral crystals and masses). Franklinite and zincite are not fluorescent.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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