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Quintinite

Year of discovery:1992 (Jacupiranga mine, Brazil; Poudrette querry, Canada), 2020 (Japan)

Locality list: A locality of quintinite

• Mg₄Al₂CO₃(OH)₁₂,3H₂O
• [Mg²⁺₄][Al³⁺₂][(OH)₁₂|CO₃]^14-,3H₂O

• Class: Quintinite group < Hydrotalcite supergroup
• Class: Carbonate - Hydroxide - Hydrate

• Mg => Fe: Caresite
• Mg => Mn: Charmarite
• Mg => Zn: Zaccagnaite

• CO₃ => Cl₂: Chlormagaluminite

• Color: White, Yellowish brown
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: Perfect on {0001} (1 plane)
• Hardness: 2
• Density: 2.1

• System: Hexagonal (2H), Trigonal (3R), Trigonal (3T), Monoclinic (1M) (Layer-stacking polytype)
• Group (2H): 622, P6₃22
• Group (2R): (-3)m, R(-3)m
• Group (3T): 32, P3₁12, P3₂12
• Group (1M): 2/m, B2/m
• Lattice (2H): a=10.6, c=15.2
• Lattice (3R): a=3.0, c=22.7
• Lattice (3T): a=10.6, c=22.7
• Lattice (1M): a=5.3, b=9.1, c=7.8, β=103.2