Formula: Ag9SbTe3(S,Se)3
Origin of name: from TSNIGRI, the acronym for a Russian geological institute
Crystal system: monoclinic
Crystal class: m or f2/m
Twinning:
Unit cell:
Colour: gray
Diaphaneity:
Luster:
Habit: anhedral grains up to 0.1 mm
Hardness: 3
Specific gravity:
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments: seen in polished sections
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