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Lazulite [abbr. Lzl ]

Year of discovery: 1795 (Freßnitzgraben, Austria), 1937 (Japan)

Locality list: 2 localities of lazulite

• MgAl₂(PO₄)₂(OH)₂
• (Mg,Fe)Al₂(PO₄)₂(OH)₂
• [Mg²⁺][Al³⁺₂][(OH)₂|(PO₄)₂]^8-

• Class: Lazulite group
• Class: Phosphate - Hydroxide
• Soluble in: hot HCl (Slowly), hot HNO₃ (Slowly), hot H₂SO₄ (Slowly)

• Mg => Fe: Scorzalite (Series)

• Color: Blue
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Distinct on {110} (2 planes), Indistinct on {101} (1 plane)
• Hardness: 5.5-6
• Density: 3.2

• System: Monoclinic
• Group: 2/m, P2₁/c
• Lattice: a=7.1, b=7.3, c=7.2, β=120.5