Abstract
IT has been noted by several investigators that the magnesium-rich orthopyroxenes are more strongly pleochrotic than the iron-rich members, indicating that the strength of the pleochroism is not dependent on the iron content. Kuno1 observed no relationship between the strength of the pleochroism and the manganese content of the mineral, he having noted no pleochroism in the manganiferous pyroxene, but suggested a possible relationship with the titanium content. In a recent investigation2, it was suggested that the strong pleochroism may be due to the high titanium content. But Howie (preceding communication) considers that the strength of the pleochroism is independent of the titanium and correlates with the alumina content.
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References
Kuno, H., Amer. Mineralogist, 39, 30 (1954).
Murty, M. S., Nature, 202, 283 (1964).
Howie, R. A., Trans. Roy. Soc. Edin., 63, 725 (1955).
Deer, W. A., et al., Rock-forming Minerals, 2, 30 (1963).
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MURTY, M. Pleochroism of Orthopyroxenes. Nature 204, 279–280 (1964). https://doi.org/10.1038/204279b0
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DOI: https://doi.org/10.1038/204279b0
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