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Hydroxylellestadite

Year of discovery: 1970 (Japan as the first occurence in the World)

Locality list: 2 localities of hydroxylellestadite

• Ca₁₀(SiO₄)₃(SO₄)₃(OH)₂
• Ca₁₀(SiO₄)₃(SO₄)₃(OH,Cl,F)₂
• [Ca²⁺₁₀][(OH)₂|(SO₄)₃|(SiO₄)₃]^20-

• Class: Ellestadite series < Ellestadite group - Apatite supergroup
• Class: Nesosilicate - Sulfate - Hydroxide

• OH => F: Fluorellestadite (Series)

• Color: Pale purple
• Streak: Pale brown
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Hardness: 4.5
• Density: 3.0

• System: Hexagonal
• Group: 6/m, P6₃/m
• Lattice: a=9.5, c=6.9

Synonym: Ellestadite-(OH) had been valid during 2008-2010.