provided by group of Prof. Shkuratov at the University of Kharkov, Ukraine
the presence of hematite (Fe2O3) concretions in Mars could imply a water-rich past in the Martian shallow subsurfaceon (Chan et al. 2004). Moreover, hematite is one of the mineral aerosol components that can be found in the Earth’satmosphere (Sokolik et al. 1999).
irregular
estimated to be in the range 3.0 + i[0.01-0.1]
Muñoz O, Volten H, Hovenier JW, Min M, Shkuratov YG, Jalava JP, van der Zande WJ, Waters LBFM. Experimental and computational study of light scattering by irregular particles with extreme refractive indices: hematite and rutile. Astronomy and Astrophysics, vol. 446, pp. 525–535, 2006
Shkuratov Yu, Ovcharenko A, Zubko E, Volten H, Muñoz O, Videen G. The negative polarization of light scattered from particulate surfaces and of independently scattering particles. Journal of Quantitative Spectroscopy and Radiative Transfer, 88, 267-284 (2004)