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...Electromagnetic spectrum visible near infrared nm mid far thermal vnir mir spectroscopy measure of the interaction between matter and radiation color object depends on wavelengths light that are reflecteds u albedo reflected incoming n soil energy atomic bonds absorbs ir greater abundance specific higher concentration bond vibration bending rotation established methodology for evaluating chemical in various materials including clay minerals si o al h c oh fe etc laboratory measurement amount transmitted through thin film or solid suspension material non absorbent media mineralogy analysis mineral structure not quantification diffuse reflectance spectra collected is unfocused cloud overtones secondary instead primary broader less well defined peaks cannot assign to specular transmission absorption forward scatter...