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Bustamite (Photo) [abbr. Bst ]

Year of discovery: 1826 (Franklin mine, USA), 1953 (Japan)

Locality list: 47 localities of bustamite

• CaMnSi₂O₆
• [(Ca²⁺,Mn²⁺)₃][Si₃O₉]^6-

• Class: Wollastonite group < 3-periodic < Pyroxenoid
• Class: Inosilicate (Single chain)
• Fluorescence: UV excitation (Red)
• Lightfastness: Color fade by light exposure

• Polymorph: Johannsenite (Low temperature, Monoclinic)

• Mn => Ca: Wollastonite
• Mn => Fe: Ferrobustamite

• Ca => Mn: Rhodonite, Pyroxmangite

• Color: Pink
• Tarnish: Pale brown
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Fibrous

• Cleavage: Perfect on {100}, {110}, and {1-10} (3 planes), Indistinct on {010} (1 plane)
• Hardness: 5.5-6.5
• Density: 3.4

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=15.4, b=7.2, c=13.8, α=89.5, β=94.9, γ=102.9

Etymology: A. Bustamente, Mexican general