Abstract
Exsolution is a known mechanism of phase transformation in pyroxenes. In particular, the transformation of the pyroxenes augite to pigeonite and vice-versa has been a subject of extent and thorough study since 1941 [1]. The transformation process involves the formation of nuclei, which gradually grow in lamellae during cooling. The precise orientation of the lamellae in relation to the parent structure is determined by the minimum interfacial energy. Transmission electron microscopy studies in these systems reveal submicroscopic textures such as periodic exsolution and micro-twinning [2]. In the present study, the phase transformation of wollastonite to diopside via the mechanism of exsolution is reported, by means of conventional and high-resolution transmission electron microscopy (TEM-HRTEM) and X-ray energy dispersive spectroscopy (EDS) microanalysis. This is a pyroxenoid to pyroxene transformation that takes place via cation substitution, i.e. a diffusion controlled process. The exact mechanism of the pyroxenoid-pyroxene transformation, which is caused by changes in pressure, temperature and cation size, has not been elucidated so far [3].
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