Fig. 3. Solubility diagram for jurbanite [AlSO₄(OH)·5H₂O], alunite [KAl₃(SO₄)₂(OH)₆], basaluminite [Al₄(OH)₁₀SO₄·17H₂O], and diaspore (AlOOH). The Al³⁺ activities were calculated from the measured Al concentration, accounting for the formation of Al–SO₄ complexes. Thermodynamic data are taken from Lindsay and Walthall (1996). Lines are calculated by assuming log = -1.83. Error bars are for log = -0.83 and log = -2.83. For alunite we assumed log(K⁺) = -5.6. Black dots represent measured data.

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