Bancroft and Burns (1967) on the basis of polarized optical spectra and Mossbauer spectra have arrived at an alternative interpretation of the optical spectra of Fe2+ in pyroxenes. In a reconnaissance of Fe2+ spectra in silicates White and Keester (1966) assigned some low frequency bands of pyroxene spectra to traces of tetrahedral ferrous iron on grounds that seemed reasonable from unpolarized spectra. Bancroft and Burns, having polarized spectra, choose an alternative interpretation of assigning these bands to spin-allowed transitions between levels split apart by the highly distorted oxygen polyhedron of the M(2) site in the pyroxene structure.

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