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Axinite-(Mg)

Year of discovery: 1975 (Merelani Hills, Tanzania), 2008 (Japan)

Locality list: A locality of axinite-(Mg)

• Ca₂MgAl₂BSi₄O₁₅(OH)
• [Ca²⁺₂][Mg²⁺][Al³⁺₂][OH|BSi₄O₁₅]^12-
• Class: Axinite group
• Class: Soro-Borosilicate - Hydroxide
• Insoluble in: HCl
• Fluorescence: UV excitation
• Mg => Fe: Axinite-(Fe)
• Mg => Mn: Axinite-(Mn)
• Color: Pale purple
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent
• Habit: Wedge shape
• Cleavage: Distinct on {100} (1 plane), Indistinct on {001} and {110} (2 planes)
• Hardness: 6.5-7
• Density: 3.3
• System: Triclinic
• Group: 1, P1
• Lattice: a=8.9, b=9.2, c=7.1, α=102.6, β=98.3, γ=88.1

Synonym: Magnesio-axinite