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Kotoite

Year of discovery: 1939 (Hol Kol mine, North Korea), 1956 (Japan)

Locality list: 2 localities of kotoite

• Mg₃B₂O₆
• [Mg²⁺₃][(BO₃)₂]^6-

• Class: Neso-Borate
• Soluble in: warm HCl, warm H₂SO₄

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

• Color: Colorless
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Granular

• Cleavage: Perfect on {110} (2 planes)
• Hardness: 6.5
• Density: 3.1

• System: Orthorhombic
• Group: mmm, Pnnm
• Lattice: a=5.4, b=8.4, c=4.5

Etymology: Professor Bunjiro Koto (1856-1935), Japanese geologist of the University of Tokyo