In the spectra of reference materials there are two kaolinite spectra, one is called kaolinite_114 and the other kaolinite_113. We can take them apart and overplot them in the same scale to see the differences:
One of the characteristics of the kaolinite spectra is the double is the doublet spectra feature in the 2200 nm region, so we can trim this region, take it apart and keep it as a diagnostic spectral feature to compare with our soil samples to determine if our soil samples contain kaolinite and in what proportion.
We can trim the zone of interest for the kaolinite and make calculations for the Area, Depth, Slope, etc. After we calculate the same values for our soil sample and compare the results to estimate how much of the reference material (in this case kaolinite) could contain our soil sample.
In the next figures we see how the spectrum is trimmed, normalized, and the area is calculated:
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