Abstract

Many spodumenes in polished section show a large variety of inclusions, some of them unusual minerals. The most common appear to be albite, plagioclase, and muscovite. It is suggested that X-ray reflections thought to indicate a low-symmetry space group for spodumene may be due to such phases in preferred orientations, and that these may also account for a good deal of the variation in spodumene analyses. Spodumene at Ravensthorpe in Western Australia is replaced by massive muscovite in three intergrown orientations related to the original structure; the chemical changes are discussed.

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