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Britholite-(Y)

Year of discovery: 1938 (Japan as the first occurence in the World)

Locality list: 8 localities of britholite-(Y)

• Ca₂Y₃(SiO₄)₃(OH)
• (Ca,Ce)₂Y₃(SiO₄,PO₄)₃(OH,F)
• [Ca²⁺₂][Y³⁺₃][OH|(SiO₄)₃]^13-

• Class: Britholite group - Apatite supergroup
• Class: Nesosilicate - Hydroxide

• Ca₂Y₃ => Ce₅: Britholite-(Ce)

• Color: Reddish brown, Black
• Streak: Pale brown
• Luster: Adamatine
• Diaphaneity: Opaque

• Cleavage: Imperfect on {0001} and {1010} (4 planes)
• Hardness: 5
• Density: 4.3

• System: Hexagonal
• Group: 6/m, P6₃/m
• Lattice: a=9.4, c=6.8

Synonym: Abukumalite