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Okayamalite

Year of discovery: 1998 (Japan as the first occurence in the World)

Locality list: A locality of okayamalite

• Ca₂B₂SiO₇
• [Ca²⁺₂][B³⁺][BSiO₇]^7-

• Class: Melilite group
• Class: Soro-Borosilicate

• BB => MgSi: Åkermanite(Akermanite)
• BB => BeSi: Gugiaite
• BB => AlSi: Alumoåkermanite(Alumoakermanite)
• BB => AlAl: Gehlenite

• Color: Pale brown
• Streak: White
• Luster: Earthy

• Habit: Massive

• Cleavage: No
• Hardness: 5.5
• Density: 3.3

• System: Tetragonal
• Group: (-4)2/m, P(-4)2₁/m
• Lattice: a=7.1, c=4.8

Etymology: Okayama prefecture, Japan, address of Fuka mine where this mineral was discovered for the first time.