The behavior of cations in some manganese minerals was studied by electrodialysis. Among the common manganese oxide minerals, psilomelane, hollandite, lithiophorite, chalcophanite and hetaerolite showed no change. Cryptomelane (alpha -MnO 2 ) shows significant cation exchange, passing through an intermediate contracted cell stage. It finally changes to gamma -MnO 2 after a few hours of dialysis. Braunite undergoes remarkable changes appearing to transform into bixbyite.

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