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Fluoborite

Year of discovery: 1926 (Tallgruvan, Sweden), 1958 (Japan)

Locality list: 2 localities of fluoborite

• Mg₃BO₃F₃
• Mg₃BO₃(F,OH)₃
• [Mg²⁺₃][F₃|BO₃]^6-

• Class: Neso-Borate - Fluoride
• Fluorescence: Short UV excitation (Pale yellow)

• F => OH: Hydroxylborite (Series)

• Color: Colorless, Pale purple
• Streak: White
• Luster: Silky, Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Indistinct on {0001} (1 plane)
• Hardness: 3.5
• Density: 2.9

• System: Hexagonal
• Group: 6/m, P6₃/m
• Lattice: a=8.8, c=3.1