Abstract
Pigeonites in igneous intrusions undergo a structural (polymorphic) transition to orthopyroxene on cooling. Poldervaart and Hess (1951) maintained that the orthopyroxene nearly always retains the b and c axes of the parent phase, but Brown (1957) (from optical examination) and Bown and Gay (1960) (from studies by single-crystal X-ray diffraction) found that, in the inverted pigeonites of the Skaergaard intrusion, the orientation of the orthopyroxene is generally random with respect to the original pigeonite (although Bown and Gay did find one crystal in which orientation had been preserved).
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© 1976 Springer-Verlag Berlin · Heidelberg
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Champness, P.E., Copley, P.A. (1976). The Transformation of Pigeonite to Orthopyroxene. In: Wenk, HR. (eds) Electron Microscopy in Mineralogy. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-66196-9_14
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DOI: https://doi.org/10.1007/978-3-642-66196-9_14
Publisher Name: Springer, Berlin, Heidelberg
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