Formula: (Mn,Ca)3Si3O9
Origin of name: For A. Bustamente, Mexican general
Crystal system: Triclinic
Crystal class: -1
Twinning: On {110}
Unit cell: a = 15.41 Ǻ, b = 7.16 Ǻ, c = 13.82 Ǻ, α = 89.5°, β = 94.8°, γ = 103°
Colour: Pale yellowish pink to brownish red
Diaphaneity: Transparent to translucent
Habit: Crystals tabular or acicular; massive, compact
Hardness: 5.5 to 6.5
Specific gravity: 3.32 to 3.43
Cleavage: 4; {100} perfect, {110} and {1-10} good, {010} poor
Synonyms/varieties:
Comments:
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