Vis-NIR reflectance spectra of Nontronite NAu-1, pure, mixed with Water ice, during and after ice sublimation

We measured the reflectance spectra (from 0.5 to 4 µm) of the Nontronite NAu-1 pure (at 300-333 K, under high vacuum) and mixed inside water ice particles (1wt%, at 173 K), as well as during and after sublimation of the water ice under high vacuum (at 173 K). The spectrum of the porous surface of Nontronite obtained after sublimation exhibits a blue spectral slope.