Abstract
USING the electron probe micro-analyser, we have-examined the composition of basal exsolution lamellæ in two calcium-rich clino-pyroxenes, one an augite in a, norite from Bon Accord Quarry, near Pretoria, Transvaal, and the other a ferro-augite in a two-pyroxene granulite from Broken Hill, New South Wales. These lamellæ have been identified optically and by X-ray diffraction as a second clino-pyroxene (space group P21/c) lying in an oriented relationship to the host (a and b crystallographic axes are common, c axes inclined to one another at an angle of a few degrees1). Such lamellæ have previously been called pigeonite, implying a calcium content of 4 per cent or more by weight calcium oxide (ref. 2).
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References
Bown, M. G., and Gay, P., Amer. Mineral., 44, 592 (1959).
Hess, H. H., Geol. Soc. Amer. Mem. 80, 41 (1960).
Reed, S. J. B., and Long, J. V. P., Proc. Third Intern. Conf. X-ray Microradiography and Microanalysis (in the press).
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BINNS, R., LONG, J. & REED, S. Some Naturally Occurring Members of the Clinoenstatite - Clinoferrosilite Mineral Series. Nature 198, 777–778 (1963). https://doi.org/10.1038/198777a0
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DOI: https://doi.org/10.1038/198777a0
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