Formula: (Ni,Mg)3Si4O10(OH)2
Origin of name: for Johannes Willemse (1909-), Professor of Geology, University of Pretoria, South Africa.
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 5.316, b = 9.149, c = 18.994, β = 99.96°
Colour: Light green
Diaphaneity: Translucent
Luster: Waxy, greasy
Habit: massive, fine-grained
Hardness: 2
Specific gravity: 3.31
Cleavage: 1; {001} perfect
Tenacity:
Streak: Greenish white
Synonyms/varieties:
Comments:
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