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Babingtonite (Photo) [abbr. Bab ]

Year of discovery: 1824 (Arendal mine, Norway), 1921 (Japan)

Locality list: 7 localities of babingtonite

Ca₂Fe₂Si₅O₁₄(OH)
• Ca₂(Fe²⁺,Mn²⁺)(Fe³⁺)Si₅O₁₄(OH)
• [Ca²⁺₂][Fe²⁺][Fe³⁺][HSi₅O₁₅]^9-

• Class: 5-periodic < Pyroxenoid
• Class: Inosilicate (Single chain) - Hydroxide
• Insoluble in: HCl, HNO₃, H₂SO₄

• Fe²⁺ => Mn: Manganbabingtonite (Series)

• Fe³⁺ => Sc: Scandiobabingtonite

• Color: Dark green
• Streak: Pale green
• Luster: Vitreous
• Diaphaneity: Opaque

• Habit: Rhombohedral, Granular

• Cleavage: Perfect on {001} (1 plane), Good on {010} and {100} (2 planes)
• Hardness: 5.5-6
• Density: 3.4

• System: Triclinic, Pseudocubic
• Group: (-1), P(-1)
• Lattice: a=7.5, b=12.2, c=6.7, α=86.3, β=93.6, γ=112.2

Etymology: W. Babington, Irish mineralogist