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Alum-(Na)

Year of discovery: before 1959 (World), 1968 (Japan)

Locality list: 3 localities of alum-(Na)

• NaAl(SO₄)₂,12H₂O
• (Na,K)Al(SO₄)₂,12H₂O
• [Na(H₂O)₆]⁺[Al(H₂O)₆]³⁺[(SO₄)₂]^4-

• Class: Alum group
• Class: Sulfate - Hydrate
• Soluble in: Water

• Na => K: Alum-(K)
• Na => NH₄: Tschermigite
• Na => Tl: Lanmuchangite

• 12H₂O => 6H₂O: Tamarugite
• 12H₂O => 11H₂O: Mendozite

• Color: Colorless
• Luster: Vitreous
• Diaphaneity: Transparent

• Hardness: 3
• Density: 1.7

• System: Cubic
• Group: m3, Pa3
• Lattice: a=12.2