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Shimazakiite

Year of discovery: 2011 (Japan as the first occurence in the World)

Locality list: A locality of shimazakiite

• Ca2B_2-xO_5-3x(OH)_3x, X=0-0.2
• [Ca²⁺₂][B₂O₅]^4- + [Ca²⁺₂][(OH)₂|HBO₃]^4-

• Class: Soro-Borate

• Ca => Mg: Suanite

• Ca₂ => CaMg: Kurchatovite, Clinokurchatovite

• Color: White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: No
• Hardness: 4
• Density: 2.8

• System: Orthorhombic (4O), Monoclinic (4M) (Layer-stacking polytype)
• Group (4O): mmm, P2₁2₁2₁
• Lattice (4O): a=3.6, b=6.4, c=19.3
• Group (4M): 2/m, P2₁/c
• Lattice (4M): a=3.5, b=6.4, c=19.3, β=92.4

Etymology: Professor Hidahiko Shimazaki (1939-), Japanese economic geologist of the University of Tokyo