Formula: Pb3CuBi7(S10Se4)
Origin of name: for T. Nordström, Swedish mineralogist
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: lead-gray
Diaphaneity: opaque
Luster: metallic
Habit: fibrous
Hardness: 2 to 2.5
Specific gravity: 7.13
Cleavage: 1; good, parallel to elongation
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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