The discussion paper by Burns (1974)h ighlightst he need for a full understanding of the contributions by both M(1) and M(2) sites to the olivine spectrum. Runciman, Sengupta, and Gourley (1973) attempted to explain the major features in terms of the M(2) sites. In particular, a detailed crystal field model was proposed and relative polarization intensities calculated. It was recognized that we had not explained all the features of the spectrum, but it was felt that a significant contribution to the interpretation of the olivine spectrum had been made.

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