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Fluorellestadite

• Ca₁₀(SiO₄)₃(SO₄)₃F₂
• Ca₁₀(SiO₄,SO₄,PO₄)₆(F,Cl,OH)₂
• [Ca²⁺₁₀][F₂|(SO₄)₃|(SiO₄)₃]^20-

• Class: Ellestadite series < Ellestadite group - Apatite supergroup
• Class: Nesosilicate - Sulfate - Fluoride
• Fluorescence: UV excitation (Bluish white)
• Soluble in: HCl, HNO₃

• F => OH: Hydroxylellestadite (Series)

• Color: Pale red, Pale purple, Yellow
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Massive

• Cleavage: Imperfect on {0001} (1 plane)
• Hardness: 4.5
• Density: 3.1

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

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