Formula: Pb4Sb6S13
Origin of name: for S. Robinson, Canadian mineralogist
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: bluish lead-gray
Diaphaneity: opaque
Luster: metallic
Habit: crystals slender prismatic, striated, massive, fibrous to compact
Hardness: 2.5 to 3
Specific gravity: 5.20 to 5.34
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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