Formula: Ag2ZnSnS4
Origin of name: after locality Pirquitas deposit, Argentina
Crystal system: tetragonal
Crystal class: -42m
Twinning:
Unit cell:
Colour: brownish gray (reflected light)
Diaphaneity: opaque
Luster: metallic
Habit: irregular grains
Hardness: 4
Specific gravity: 4.82
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments: series with hocartite
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