Abstract
DR. M. S. MURTY has recently concluded1 on the basis of two analysed minerals that the strength of the pleochroism of orthopyroxenes of the charnoekite series can be correlated with their titanium content, it having been noted earlier2 that the pleochroism is independent of the iron content of these minerals. More recently, however, it was suggested3 that the pleochroism of orthopyroxenes can be correlated with their alumina content and with the resultant contraction of their cell parameters, that is, it may be largely a physical effect.
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References
Murty, M. S., Nature, 202, 283 (1964).
Howie, R. A., Trans. Roy. Soc. Edin., 63, 725 (1955).
Howie, R. A., Min. Soc. Amer., Spec. Paper, 1 (I.M.A., Papers, Third Gen. Meeting), 213 (1963).
Howie, R. A., Min. Mag., 33, 903 (1964).
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HOWIE, R. Pleochroism of Orthopyroxenes. Nature 204, 279 (1964). https://doi.org/10.1038/204279a0
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DOI: https://doi.org/10.1038/204279a0
