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Adachiite

Year of discovery: 2013 (Japan as the first occurence in the World)

Locality list: A locality of adachiite

• CaFe₃Al₇(BO₃)₃Si₅O₁₈(OH)₄
• (Ca,Na)(Fe,Al,Mg,Ti)₃(Al,Fe,Mg)₇(BO₃)₃Si₅O₁₈(OH)₄
• [Ca²⁺][Fe²⁺₃][Al³⁺][Al³⁺₅][(OH)₃|OH|(BO₃)₃|AlSi₅O₁₈]^26-

• Class: Calcic-tourmaline group < Tourmaline supergroup
• Class: Cyclo-Aluminosilicate (Single ring) - Borate - Hydroxide

• Al₂ => MgSi: Feruvite

• Color: Black-Brownish purple
• Luster: Vitreous
• Diaphaneity: Translucent

• Habit: Prismatic

• Hardness: 7

• System: Trigonal
• Group: P3m
• Lattice: a=15.9, c=7.2

Etymology: Tomio Adachi (1932-), high school teacher and amateur mineral collector.