Formula: Mn(Sb,Fe)O3
Origin of name: From Greek for black and antimony - stibium
Crystal system: Hexagonal
Crystal class: -3
Twinning:
Unit cell:
Colour: Coal black
Diaphaneity:
Luster:
Habit: Crystals small, striated, in porous sponge-like aggregates
Hardness: ~ 4
Specific gravity: 5.63
Cleavage: 1; {0001} perfect
Tenacity:
Streak: Light rouge red to cherry
Synonyms/varieties:
Comments:
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