Formula: PbCuBi11(S,Se)18
Origin of name: after locality Peko mine, Northern Territory, Australia
Crystal system: orthorhombic
Crystal class: mm2
Twinning:
Unit cell:
Colour: lead-gray
Diaphaneity: opaque
Luster: metallic
Habit: crystal, to 1 to 2 mm
Hardness:
Specific gravity: 6.80
Cleavage: none
Tenacity:
Streak: lead-gray
Synonyms/varieties:
Comments:
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