silica is found in clays in bound and free form. the bound form is presented by the clay minerals (kaolonite, montmorillonite ..... etc.) the free form is given by the quartz sand or by dusty fine particles. my question is as follows: "can we calculate the percentage of free quartz in the silica, I do not try to define it by the XRD, I look for a formula or another process if it is possible?
Dear Mrs. Hafida:
You can take a mineralogical approach using XRD (Rietveld) and a chemical one described in the paper below making use of differential leaching:
DILL, H.G., STUMMEYER, J. and SIEWERS, U. (2002) Selective leaching of biogenic and geogenic silica in diatomaceous siliciclastics of the Kathmandu paleolake, Nepal.- Neues Jahrbuch für Mineralogie Mh., 2002 (1): 515-528.
With kind regards
H.G.Dill
Sieve analysis perhaps may lead you to decide some quantitative analysis that will helpful likely to formulate the quantities.
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