Formula: (Fe,Mn)8Si6O15(OH,Cl)10
Origin of name: From iron (Latin ferrum) and manganpyrosmalite
Crystal system: Hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell: a = 13.33 Ǻ, c = 7.11 Ǻ
Colour: Colourless in thin section
Diaphaneity:
Luster:
Habit: Platy to radiating subhedral to euhedral 0.2-1mm
Hardness:
Specific gravity: 3.14
Cleavage: 1; {001} good
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with manganopyrosmalite
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