Formula: Pb2(Sb,As)2S5
Origin of name: for R. W. Van der Veen (1883-1925), Dutch economic geologist and metallographer.
Crystal system: Orthorhombic
Crystal class: mm2 or 2/m 2/m 2/m
Twinning: Lamellar
Unit cell: a = 4.22, b = 26.2, c = 7.9
Colour: Steel-gray
Diaphaneity: Opaque
Luster: Metallic
Habit: Crystals elongated, prism zone equant, faces roughened, grooved, anhedral grains, massive
Hardness: 3.5
Specific gravity: 5.92
Cleavage: None
Tenacity: Brittle, conchoidal fracture
Streak: Black, with faint brownish
Synonyms/varieties:
Comments:
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