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Uvite

Year of discovery: 1929 (Uva province, Sri Lanka), 1995 (Japan)

Locality list: 2 localities of uvite

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

• Class: Calcic-subgroup 1 < Calcic-tourmaline group < Tourmaline supergroup
• Class: Cyclosilicate (Single ring) - Borate - Hydroxide
• Electrical: Piezoelectric, Pyroelectric

• Mg => Fe: Feruvite

• OH => F: Fluor-uvite (Series)

• CaMg => NaAl: Dravite (Series)

• Color: Black, Greenish black, Brownish black
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

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