Formula: PbAgAsS3
Origin of name: For John Marr, British geologist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Lead-gray to steel-gray
Diaphaneity:
Luster: Metallic
Habit: Crystals equant to tabular
Hardness: 3
Specific gravity: 6.23
Cleavage: None
Tenacity:
Streak: Black with brown tinge
Synonyms/varieties:
Comments:
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