Spectral variability of plagioclase-mafic mixtures (2): Investigation of the optical constant and retrieved mineral abundance dependence on particle size distribution

The retrieved optical constants have been used to model reflectance spectra of plagioclase-mafic assemblage mixtures and modeled spectra were compared to measured ones. We find that the particle size distribution of the material plays an important role also in modeling mixtures spectra. Plagioclase abundance is modeled within an error of ±4% for the most of the mixtures if a multidisperse distribution is assumed, with a higher uncertainty only for mixtures with low amount of plagioclase.