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Fukalite

Year of discovery: 1976 (Japan as the first occurence in the World)

Locality list: 3 localities of fukalite

• Ca₄Si₂O₆(CO₃)(OH)₂
• Ca₄Si₂O₆(CO₃)(OH,F)₂
• [Ca²⁺₄][(OH)₂|CO₃|(SiO₃)₂]^8-

• Class: Inosilicate (Single chain) - Carbonate - Hydroxide

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

• Hardness: 4
• Density: 2.8

• System: Monoclinic (Tilleyite-type), Orthorhombic (Tobermorite-type), and 4 other types (Order-Disorder polytype)
• Group: 2/m, P2₁/b
• Lattice: a=7.6, b=23.4, c=11.5, β=109.2

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