Formula: Mn2(Fe,Mg)5Si8O22(OH)2
Origin of name: From manganese and grunerite
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Dark green, brown
Diaphaneity: Transparent to nearly opaque
Luster: Silky
Habit: Fibrous or fibro-lamellar
Hardness: 5 to 6
Specific gravity: 3.34
Cleavage: 1; {110} good
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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