Gypsum soil spectra

NIR Soil spectra can have different shapes and bands. Normally when working with soil spectra we can identify the band associated with clay, carbonates, organic matter,... This time when looking to a soil spectra database I found some different shapes that ddid not interfere with other bands so they must be easily identified when consulting bibliography. These bands are for soil with high gypsum content.

In the figure there are high gypsum soils merged with other different type of soil spectra. See the triple band shape in the 1400 to 1550 nm area and the peak at 1748 nm with a clear band where the other soils did not absorb.