Formula: (Mg,Fe)7Si8O22(OH)2
Origin of name: From magnesium and cummingtonite
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Dark green, grayish green, brown, white, light gray
Diaphaneity: Translucent to nearly opaque
Luster: Silky
Habit: Fibrous or fibro-lamellar, radial groups
Hardness: 5 to 6
Specific gravity: 3.13
Cleavage: 1; {110} good
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with cummingtonite and grunerite
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