Abstract
The “intermediate plagioclase structure” (Cole et al., 1951), the object of this study, occurs in single-phase low plagioclases between approximately 25 and 68 mole percent anorthite and, in exsolved specimens, extends from at least 8 to 84 mole percent anorthite. It is defined (Bown and Gay, 1958) as lacking the (b)-, (c)-, and (d)-type reflections present in diffraction patterns of anorthites. Besides the (a)-type reflections observed in all feldspars, it contains rows of (e)-satellites in symmetric positions to the (b)-type reflection positions for plagioclases having the I 1 structure as well as rows of (f)-satellites (parallel to those of the (e)-type satellites) in symmetric positions to the (a)-reflections.
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Hashimoto, H., Nissen, HU., Ono, A., Kumao, A., Endoh, H., Woensdregt, C.F. (1976). High-resolution Electron Microscopy of Labradorite Feldspar. In: Wenk, HR. (eds) Electron Microscopy in Mineralogy. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-66196-9_25
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DOI: https://doi.org/10.1007/978-3-642-66196-9_25
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