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Dawsonite

Year of discovery: 1874 (McGill University campus, Canada), 1972 (Japan)

Locality list: 20 localities of dawsonite

• NaAlCO₃(OH)₂
• [Na⁺][Al³⁺][(OH)₂|CO₃]^4-

• Class: Carbonate - Hydroxide
• Soluble in: HCl (with bubbles)
• Fluorescence: Short UV excitation (White, some examples)

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

• Habit: Acicular
• Aggregate: Radial

• Cleavage: Perfect on {110} (2 planes)
• Hardness: 3
• Density: 2.4

• System: Orthorhombic
• Group: mmm, Imma
• Lattice: a=6.8, b=10.4, c=5.6

• Significance: Low temperature, Alkaline