Dear Hashim,

Your question is not very clear. However I presume clay fractions of your soil have quartz,feldspar and calcite minerals, which are actually clay sized (< 2 micrometer) primary minerals. If you take fine clay fractions ( < 0.2 or < 0.1 micrometer )of soils, presence of such minerals may not be there at all.

Dear Dr. Dilip Kumar Pal..

Thanks for your answer..

But some peaks of these minerals appears in the x_ray sheet..

Dear Mr. Aldhahi,

I learnt from your question that you separated your soil sample and selected the finest particle size for XRD. Despite this grain size fractionation you identified besides phyllosilicates also feldspar, quartz and calcite. They will not make up the majority of the mineral assemblage but traces are not uncommon there.

I suggest to make two principal suites, one called phyllosilicates or sheet silicates (I would not use in this case the technical term clay minerals for size and crystallographic reasons), the other non-phyllosilicates. This subdivision can also be used for quantification using methods like Rietveld. If you are able to determine the accessory minerals of this size fraction use words like tectosilicates (e.g. feldspar) and carbonate minerals (e.g. calcite). You can also go a step further and describe them more precisely as calcite, or alkaline feldspar.

As long as you can put them into a tripartite classification scheme you can also plot them in triplots, e.g. phyllosilicates-carbonate minerals - tectosilicates.

I wish you much success

H.G.Dill