Formula: (Mn,Fe)2(Fe,Mg)5(Si4O11)2(OH)2
Origin of name: The name indicates the structural relationship to protoamphiboles, and the compositional relationship to protoferro-anthophyllite and anthophyllite.
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 9.425, b = 18.303, c = 5.345
Colour: Light brownish yellow, white
Diaphaneity: Transparent
Luster: Vitreous
Habit: Wheat sheafs, acicular
Hardness: 5-6
Specific gravity: 3.5
Cleavage: [210] perfect
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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