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Vermiculite In South Africa

2015-5-25Structure. V ermiculite is a 21 clay meaning it has 2 tetrahedral sheets for every one octahedral sheet. It is a limited expansion clay with a medium shrink-swell capacity.Vermiculite has a high cation exchange capacity at 100-150 lt meq100 g.Vermiculite clays are weathered micas in which the potassium ions between the molecular sheets are replaced by magnesium and iron ions

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