Formula: ZnS
Origin of name: for C. Wurtz, French chemist
Crystal system: hexagonal
Crystal class: 6mm
Twinning:
Unit cell: a = 3.820 Å, c = 6.260 Å
Colour: brownish black to orange-brown
Diaphaneity:
Luster: resinous
Habit: crystals hemimorphic pyramidal or short prismatic to tabular, often striated horizontally, crusts, banded, fibrous
Hardness: 3.5 to 4
Specific gravity: 3.98 to 4.08
Cleavage: 2; {11-20} distinct, {0001} imperfect
Tenacity: brittle
Streak: brown
Synonyms/varieties:
Comments: data are for wurtzite-2H, there are also -4H, -6H, -8H, -15R, -18R and -21R polytypes, trimorphous with matraite and sphalerite, fluoresces orange under LW ultraviolet light
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