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Feruvite

Year of discovery: 1989 (Repanga island (Cuvier island), New Zealand), 2003 (Japan)

Locality list: 3 localities of feruvite

• CaFe₃Al₅Mg(BO₃)₃Si₆O₁₈(OH)₄
• Ca(Fe,Mg)₃Al₅Mg(BO₃)₃Si₆O₁₈(OH)₄
• [Ca²⁺][Fe²⁺₃][Mg²⁺][Al³⁺₅][(OH)₃|OH|(BO₃)₃|(SiO₃)₆]^25-

• Class: Calcic-subgroup 1 < Calcic-tourmaline group < Tourmaline supergroup
• Class: Cyclosilicate (Single ring) - Borate - Fluoride
• Electrical: Piezoelectric, Pyroelectric

• Fe => Mg: Uvite

• OH => F: Fluor-feruvite

• CaMg => NaAl: Schorl

• MgSi => Al₂: Adachiite

• Color: Brownish black
• Streak: Gray
• Luster: Vitreous
• Diaphaneity: Translucent-Opaque

• Cleavage: No
• Hardness: 7
• Density: 3.2

• System: Trigonal
• Group: 3m, R3m
• Lattice: a=16.0, c=7.2