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Lazurite [abbr. Lzr ]

• Na₃CaAl₃Si₃O₁₂S
• (Na,Ca)₄Al₃Si₃O₁₂(S,SO₄,Cl₂)
• [Na⁺₃][Ca²⁺][S|(AlSiO₄)₃]^5-

• Class: Sodalite group
• Class: Tecto-Aluminosilicate - Sulfide
• Soluble in: HCl
• Lapis Lazuli, a gemstone, is mixture of lazurite and pyrite.

• S => Cl₂: Sodalite
• S => SO₄: Nosean

• Color: Blue
• Streak: Blue
• Luster: Vitreous
• Diaphaneity: Translucent

• Aggregate: Pyrite is accompanied.

• Cleavage: Imperfect on {110} (4 planes)
• Hardness: 5-5.5
• Density: 2.4

• System: Cubic, Orthorhombic, Monoclinic, Triclinic (Layer-stacking polytype)
• Group: (-4)3m, P(-4)3n
• Lattice: a=9.1

• Coexist: Pyrite