Formula: Pb5(AsO3)3Cl
Origin of name: For K. Finneman, Långban, Sweden
Crystal system: Hexagonal
Crystal class: 6/m
Twinning:
Unit cell:
Colour: Gray to black
Diaphaneity: Translucent to opaque
Luster: Subadamantine
Habit: Crystals prismatic, small; crusts
Hardness: 2.5
Specific gravity: 7.27
Cleavage: 1; {10-11} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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