Mineral interpretation of a planet surface using spectral libraries can be improved if the spectral variability, often characterizing the spectral data, can be explained as the result of well-defined geological processes. Reflectance spectra of metamorphic rocks are analyzed. Selected examples point out systematic and non-systematic relationships between spectral parameters (band wavelength, shape, and reflectance peaks) and geologically controlled variables (composition of minerals and mineral assemblages), thus establishing a conceptual framework that can facilitate the analysis of unknown spectra.
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