Formula: (K,Na,Ca)4(Fe,Fe,Mn)2Si8O20(OH, F)
Origin of name: Combination of symbols of elements
Crystal system: Triclinic
Crystal class: -1
Twinning:
Unit cell: a = 6.98, b = 8.24, c = 9.98, Z = 1; α = 114.2°, β = 80.22°, γ = 115.6°
Colour: Light rose
Diaphaneity: Transparent to translucent
Luster: Pearly on cleavage
Habit: Grains to large size
Hardness: 5 to 5.5
Specific gravity: 2.74
Cleavage: 2; {100} and {010} good
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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