Formula: Tl2SnAs2S6
Origin of name: For Ernst Niggli, Swiss mineralogist
Crystal system: Hexagonal
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Steel gray to black-gray
Diaphaneity: Opaque
Luster:
Habit: Prismatic hexagonal crystals <1 mm
Hardness: 2 to 3
Specific gravity: 5.24
Cleavage: 1; {0001} micaceous
Tenacity:
Streak: Reddish black
Synonyms/varieties:
Comments:
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