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Alunogen (Photo)

Year of discovery: 1832 (World), 1915 (Japan)

Locality list: 46 localities of alunogen

• Al₂(SO₄)₃,17H₂O
• [Al(H₂O)₆]³⁺₂[(SO₄)₃]^6-,5H₂O

• Class: Sulfate - Hydrate
• Soluble in: Water
• Taste: Sour

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

• Cleavage: Perfect on {010} (1 planes), Good on {100} (1 plane), Distinct on {313} (1 plane)
• Hardness: 1.5-2

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=7.4, b=27.0, c=6.1, α=90.0, β=97.6, γ=91.9