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Mendozite

Year of discovery: 1868 (San Juan, Argentina), 1936 (Japan)

Locality list: A locality of mendozite

• NaAl(SO₄)₂,11H₂O
• [Na⁺][Al³⁺][(SO₄)₂]^4-,11H₂O

• Class: Sulfate - Hydrate
• Soluble in: Water
• Dehydrate to Tamarugite.

• 11H₂O => 6H₂O: Tamarugite
• 11H₂O => 12H₂O: Alum-(Na)

• Color: Colorless
• Tarnish: White (by dehydration)
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: Good on {100} (1 plane), Indistinct on {010} and {001} (2 planes)
• Hardness: 3
• Density: 1.7

• System: Monoclinic
• Group: 2/m, C2/c
• Lattice: a=21.8, b=9.1, c=8.3, β=92.5