"The weathering of the silicate minerals is considered a function of two variables, (1) the mobilities of the essential cations and (2) the mineral structure. It would appear that in the normal pH range of 4 to 10, the leaching potential is the most important factor influencing the mobilities of the cations though the redox potential considerably affects the solubility of iron. Parent mineral structures are instrumental in controlling the accessibility of the percolating waters to the bonding cations."

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