Formula: (Mn,Zn)2Te3O8
Origin of name: for K. Spiroff, American mineralogist
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 12.87 Å, b = 5.39 Å, c = 11.88 Å, b = 98.1°
Colour: red to purple
Diaphaneity:
Luster: adamantine
Habit: massive, cleavable
Hardness: about 3.5
Specific gravity: 5.01
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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