Formula: Pb(Bi,Sb)6S10
Origin of name: after locality Ustarasaisk, Tien-Shan Mountains, Russia
Crystal system: Orthorhombic?
Crystal class: unknown
Twinning:
Unit cell:
Colour: Silvery gray to gray
Diaphaneity: Opaque
Luster: Metallic
Habit: Crystals prismatic, may be bent or twisted
Hardness: 2.5
Specific gravity:
Cleavage: 2; one perfect, one indistinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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