Formula: Ba4Ca6(Si,Al)20O39(OH)2(SO4)3.nH2O
Origin of name: for Eduard Wenk (1907-2001), professor of petrology, University of Basel, Switzerland.
Crystal system: Hexagonal
Crystal class: 62m
Twinning:
Unit cell: a = 13.511, c = 7.462
Colour: Light gray
Diaphaneity: Transparent to translucent
Luster: Vitreous to pearly, greasy on fractures
Habit: crystals prismatic, to 5 cm, columnar
Hardness: 6
Specific gravity: 3.13
Cleavage: 1; prismatic poor
Tenacity: Brittle
Streak: White
Synonyms/varieties:
Comments:
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