Formula: Zn2SiO4
Origin of name: for William I (1772-1843), King of the Netherlands (1813-1840)
Crystal system: Hexagonal
Crystal class: 3
Twinning:
Unit cell: a = 13.94 Å, c = 9.31 Å
Colour: Colourless, white, green, yellow, red, brown, gray
Diaphaneity: Transparent to translucent to opaque
Luster: Vitreous to resinous
Habit: Crystals stout to long slender prismatic, hexagonal, disseminated grains, massive, compact or fibrous
Hardness: 5.5
Specific gravity: 3.89 to 4.19
Cleavage: 2; {0001} and {11-20} poor
Tenacity: Conchoidal to uneven fracture, brittle
Streak: White
Synonyms/varieties: Troostite (red-brown variety)
Comments: Often fluoresces intense yellowish green SW-UV, often strongly phosphorescent
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