Abstract
Previous discussions of the pyroxenoid and clinopyroxene crystal structures have noted the polysomatic relationship between them, in which pyroxenoids with chain periodicities greater than three contain both pyroxeno-like (P) and wollastonite-like (W) modules. However, disagreement exists in the published literature as to whether the P modules of pyroxenoids are, in fact, structurally equivalent to those of pyroxenes. By examining the structural attributes of the P modules of pyroxmangite, we show that they correspond to slabs of clinopyroxene cut parallel to (111)cpx and oriented in pyroxmangite parallel to (001)pyd. This orientation is identical to that observed in pyroxene-pyroxenoid inter-growths.
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