Formula: Ag5Pb8Bi13S30
Origin of name: for the Vikings, who settled Greenland in the tenth century (in reference to the type locality Ivigtut, Greenland)
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: Common, on {010}, twin lamellae || [001]
Unit cell: a = 13.603, b = 25.248, c = 4.112, Z = 1; beta = 95.55°
Colour: Gray, light gray to steel-blue in reflected light
Diaphaneity: Opaque
Luster: Metallic
Habit: Lamellar grains, 0.5 mm, twinned, microscopic
Hardness: 3.5
Specific gravity: 6.94
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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