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Cryolite [abbr. Crl ]

• Na₃AlF₆
• α-[Na⁺₃][Al³⁺F₆]^3-

• Class: Elpasolite subgroup < Stoichiometric double group (A₂BB'X₆) < Stoichiometric perovskites < Perovskite supergroup
• Class: Fluoride
• Soluble in: Water (Slightly), H₂SO₄ (release HF)
• Insoluble in: HCl
• Fluorescence: UV excitation (Pale blue), Thermoluminescence
• Alter to Hydrokenoralstonite.

• Na₃ => Na₂Li: Simmonsite
• Na₃ => NaK₂: Elpasolite
• Na₃ => CaLi: Colquiriite

• Color: Colorless, White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Pseudocubic

• Cleavage: No, Parting on {001} and {110} (3 planes)
• Hardness: 2.5
• Density: 3.0

• System: Monoclinic
• Group: 2/m, P2₁/n
• Lattice: a=7.8, b=5.6, c=5.4, β=90.2