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Fluor-uvite

• CaMg₄Al₅(BO₃)₃Si₆O₁₈(OH)₃F
• (Ca,Na)(Mg,Fe)₄Al₅(BO₃)₃Si₆O₁₈(OH,F)₄
• [Ca²⁺][Mg²⁺₃][Mg²⁺][Al³⁺₅][(OH)₃|F|(BO₃)₃|(SiO₃)₆]^25-

• Class: Calcic-subgroup 1 < Calcic-tourmaline group < Tourmaline supergroup
• Class: Cyclosilicate (Single ring) - Borate - Fluoride - Hydroxide
• Fluorescence: Short UV excitation (Yellow)
• Electrical: Piezoelectric, Pyroelectric

• Mg => Fe: Fluor-feruvite

• F => OH: Uvite (Series)

• CaMg => NaAl: Fluor-dravite (Series)

• Color: Black, Greenish black, Brownish black
• Streak: Pale brown, Pale green
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: No
• Hardness: 7.5
• Density: 3.0

• System: Trigonal
• Group: 3m, R3m
• Lattice: a=16.0, c=7.2