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Nagashimalite (Photo)

Year of discovery: 1980 (Japan as the first occurence in the World)

Locality list: 2 localities of nagashimalite

• Ba₄V₄B₂Si₈O₂₈(OH)Cl
• Ba₄(V,Ti)₄B₂Si₈O₂₇(O,OH)₂Cl
• [Ba²⁺₄][V³⁺₄][OH|Cl|(BSi₄O₁₄)₂]^20-

• Class: Cyclo-Borosilicate - Chloride - Hydroxide

• V => Fe: Taramellite
• V => Ti: Titantaramellite

• Color: Greenish black
• Streak: Green
• Luster: Vitreous
• Diaphaneity: Translucent

• Habit: Prismatic with pyramidal end faces, acicular

• Cleavage: No
• Hardness: 6
• Density: 4.1

• System: Orthorhombic
• Group: mmm, Pmmn
• Lattice: a=13.9, b=12.1, c=7.1

Etymology: Otokichi Nagashima (1890-1969), Japanese amateur mineral collector.