Formula: (Fe,Ni,Co)As
Origin of name: for Dr. Jan Westerveld (1905-1962), Professor of Geology and Mineralogy, University of Amsterdam, The Netherlands.
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 3.457, b = 5.971, c = 5.332
Colour: Brownish white to gray in polished section
Diaphaneity: Opaque
Luster: Metallic
Habit: Irregular blebs, minute, and in stringer in maucherite
Hardness: 5.5-6
Specific gravity: 8.13 (calculated)
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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