Willemite

Willemite is a zinc silicate (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. Willemite is usually formed as an alteration of previously existing sphalerite  ore bodies, and is usually associated with limestone. It occurs in many places, but is best known from Arizona and the world famous zinc, iron, manganese deposits at Franklin Furnace, 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.
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(n.)
A silicate of zinc, usually occurring massive and of a greenish yellow color, also in reddish crystals (troostite) containing manganese.
  

General Information:
 Chemical Formula:
Zn2SiO4
 Composition:
(Molecular Weight = 222.86 gm)
Zinc 58.68 % Zn
Silicon 12.60 % Si
Oxygen 28.72 % O 
 Empirical Formula:
Zn2(SiO4)
 Environment:
Main ore mineral at Franklin, a metamorphosed zinc orebody.
 Locality:
Franklin, Sussex Co., New Jersey, USA.
 Name Origin:
After Willem I, King of the Netherlands (1772-1843).
Physical Properties:
 Cleavage:
[0001] Poor, [1120] Poor
 Color:
white, yellow, green, reddish brown, or black.
 Density:
3.9 - 4.2, Average = 4.05
 Diaphaniety:
Transparent to translucent to opaque
 Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Massive - Granular - Common texture observed in granite and other igneous rock., Massive - Uniformly indistinguisha ble crystals forming large masses.
 Hardness:
5.5 - Knife Blade
 Luminescence:
Fluorescent, Short UV=green.
 Luster:
Vitreous - Resinous
 Streak:
white
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Eng: willemite
Urdu: (نیدَر لینڈ کے بادشاہ وِلیَم کے نام پَر ) وِلیمائیت ۔ جِست کی بَرت ، جِست کا سِلی کیٹ ۔