Formula: PbCuBi(S,Se)3
Origin of name: for Frantisek Soucek, Czech mineralogist
Crystal system: orthorhombic
Crystal class: mm2
Twinning: polysynthetic
Unit cell:
Colour: lead-gray
Diaphaneity: opaque
Luster: metallic
Habit: anhedral grains, to 0.01 mm, finely polysynthetic twinned
Hardness:
Specific gravity: 7.60
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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