Alumina 1 Aluminum oxide 1 Anthracite 1 Coal sample 1 Feldspar 1 Fold-thrust belts 1 Geochemistry 1 Himalayan fold-thrust belt 1 Himalayan fold-thrust belts 1 Illite-stretching frequency 1 Intensity ratio 1 Kaolinite 1 Kaolinite to quartz-feldspar intensity ratio 1 Montmorillonite stretching and bending intensities 1 Montmorillonite stretching and bending intensity 1 Potassium 1 Potassium metasomatism 1 Quartz 1 Source rocks 1 Stretching frequency Weathering 1