Abstract
The reflectance spectra for the isotypic orthorhombic minerals marcasite, FeS2 and lollingite, FeAs2 have been measured in air and in immersion oil between 400 and 800 nm, and the indices of refraction and absorption indices have been calculated. Marcasite shows a practically “isotropic” behaviour of the optical constants, lollingite is characterized by a “uniaxial” optical behaviour with maximum absorption occurring perpendicular to the relatively short Fe-Fe distances.
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