Abstract
The polarized (E‖a′, E‖b and E‖c) electronic absorption spectra of five natural chromium-containing clinopyroxenes with compositions close to chromdiopside, omphacite, ureyite-jadeite (12.8% Cr2O3), jadeite, and spodumene (hiddenite) were studied.
The polarization dependence of the intensities of the Cr3+ bands in the clinopyroxene spectra cannot be explained by the selection rules for the point groups C 2 or C 2v but can be accounted for satisfactorily with the help of the higher order pseudosymmetry model, i.e. with selection rules for the point symmetry group C 3v. The trigonal axis of the pseudosymmetry crystal field forms an angle of 20.5° with the crystallographic direction c in the (010) plane.
D q increases from diopside (1542 cm−1) through omphacite (1552 cm−1), jadeite (1574 cm−1) to spodumene (1592 cm−1). The parameter B which is a measure of covalency for Cr3+-O bonds at M1 sites in clinopyroxene depends on the Cr3+ concentration and the cations at M2 sites.
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Khomenko, V.M., Platonov, A.N. Electronic absorption spectra of Cr3+ ions in natural clinopyroxenes. Phys Chem Minerals 11, 261–265 (1985). https://doi.org/10.1007/BF00307404
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DOI: https://doi.org/10.1007/BF00307404