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Axinite-(Fe) (Photo)

Year of discovery: 1909 (St Christophe-en-Oisans, France), 1885 (Japan)

Locality list: 147 localities of axinite-(Fe)

• Ca₂FeAl₂BSi₄O₁₅(OH)
• Ca₂(Fe,Mn)Al₂BSi₄O₁₅(OH)
• [Ca²⁺₂][Fe²⁺][Al³⁺₂][OH|BSi₄O₁₅]^12-

• Class: Axinite group
• Class: Soro-Borosilicate - Hydroxide
• Soluble in: HF
• Insoluble in: HCl, HNO₃, H₂SO₄

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

• Color: Brown, Purple
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Wedge shape

• Cleavage: Perfect on {100} (1 plane), Indistinct on {001}, {110}, and {011} (3 planes)
• Hardness: 6.5-7
• Density: 3.3

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=7.1, b=9.2, c=9.0, α=91.9, β=98.2, γ=77.3

Synonym: Ferro-axinite