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Jimboite

Year of discovery: 1963 (Japan as the first occurence in the World)

Locality list: 3 localities of jimboite

• Mn₃B₂O₆
• (Mn,Mg)₃(BO₃)₂
• [Mn²⁺₃][(BO₃)₂]^6-

• Class: Neso-Borate

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

• Color: Pale purplish brown, Reddish brown
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: Perfect on {110} (2 planes)
• Hardness: 5.5
• Density: 4.0

• System: Orthorhombic
• Group: mmm, Pnmn
• Lattice: a=5.7, b=8.7, c=4.7

Etymology: Kotora Jimbo (1867-1924), The first professor of mineralogy of the University of Tokyo