Formula: Ag3Pb3-6Bi9-7S18
Origin of name: for J. Schirmer, American bureaucrat
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: lead-gray to iron-black
Diaphaneity: opaque
Luster: metallic
Habit: massive, fine granular
Hardness: 2
Specific gravity: 6.74
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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