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Takedaite

Year of discovery: 1995 (Japan as the first occurence in the World)

Locality list: A locality of takedaite

• Ca₃(BO₃)₂
• [Ca²⁺₃][(BO₃)₂]^6-

• Class: Neso-Borate

• Ca => Mg: Kotoite
• Ca => Mn: Jimboite

• Ca₂ => Sn: Nordenskiöldine, Nordenskioldine

• Color: White, Pale gray
• Streak: White
• Luster: Vitreous
• Diaphaneity: Translucent

• Habit: Granular

• Cleavage: Imperfect on {110} (3 planes)
• Hardness: 4.5
• Density: 3.1

• System: Trigonal
• Group: (-3)m, R(-3)c
• Lattice: a=8.6, c=11.9

Etymology: Professor Hiroshi Takeda (1934-), Japanese mineralogist of the University of Tokyo