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Axinite-(Mn) (Photo)

Year of discovery: 1909 (Harz, Germany, and Franklin mine, USA), 1893 (Japan)

Locality list: 51 localities of axinite-(Mn)

• Ca₂MnAl₂BSi₄O₁₅(OH)
• Ca₂(Mn,Fe)Al₂BSi₄O₁₅(OH)
• [Ca²⁺₂][Mn²⁺][Al³⁺₂][OH|BSi₄O₁₅]^12-

• Class: Axinite group
• Class: Soro-Borosilicate - Hydroxide
• Insoluble in: HCl
• Fluorescence: UV excitation (Red, Franklin, NJ only)

• Ca => Mn: Tinzenite (Series)

• Mn => Fe: Axinite-(Fe) (Series)
• Mn => Mg: Axinite-(Mg)

• Color: Brown, Yellow, Pale purple
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Thin Platy

• Cleavage: Distinct on {100} (1 plane), Indistinct on {001} and {110}
• Hardness: 6.5-7
• Density: 3.2

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=7.2, b=9.2, c=9.0, α=88.3, β=82.8, γ=77.3

Synonym: Manganaxinite