Formula: (Mn,Fe)8Si6O15(OH,Cl)10
Origin of name: From manganese and (ferro-)pyrosmalite
Crystal system: Hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell: a = 13.36 Å, c = 7.16 Å
Colour: Brown
Diaphaneity:
Luster: Pearly on {0001}
Habit:
Hardness: 4.5
Specific gravity: 3.13
Cleavage: 1; {0001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: Dimorphous with brokenhillite; series with ferropyrosmalite
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