Alteration of hydration absorption features in reflectance spectra of selected sulfates in a low pressure environment: 0.45-4.3 μm

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Introduction: Spectral reflectance properties from. 0.45 to 4.3 μm have been investigated for a number of. mineral samples. Eight mineral samples were placed. in one of the environmental simulation chambers in the. University of Winnipeg’s spectroscopy lab [1,2]. The. eight samples and two standards spent 38 days in the. chamber. Of the eight samples (three silicates, two. carbonates and three sulfates), only the sulfate data are. presented here, with specific focus on their hydration. features and the changes seen in those features over. time. Spectra for two of the three samples, gypsum. and hexahydrite, are presented below. The spectra for. jarosite is not included as we saw no systematic measurable. difference in its spectra over the 38 days.

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