Formula: (Pb,Tl)2AgAs2S5
Origin of name: For F. Hatch, American mining engineer
Crystal system: Triclinic
Crystal class: -1 or 1
Twinning:
Unit cell:
Colour: Lead-gray
Diaphaneity:
Luster:
Habit: Crystals modified
Hardness:
Specific gravity: 5.81
Cleavage: None
Tenacity:
Streak: Chocolate brown
Synonyms/varieties:
Comments:
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