Abstract
A brief summary of the detailed historical treatment in 2, 553–647 is augmented here by a review of the post-1973 literature. Feldspar is intergrown with quartz in (1) myrmekite, a symplectite (Greek, plait together) of quartz and sodic plagioclase occurring mainly at grain boundaries (Sec. 20.1.1); (2) granophyric intergrowth of quartz and alkali feldspar typically occurring as a mesostasis (Sec. 20.1.2.); (3)graphic granite, a coarse intergrowth of quartz and K-feldspar perthite or sodic plagioclase in a restricted zone of granite pegmatites (Sec. 20.1.3); and (4) spherulitic intergrowths in devitrified rhyolites (Sec. 20.2). A symplectite of quartz and calcic plagioclase occurs in some basic rocks (Sec. 20.1.4). Feldspar is intergrown with nepheline (Sec. 20.3) in various alkaline rocks.
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© 1988 Springer-Verlag Berlin Heidelberg
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Smith, J.V., Brown, W.L. (1988). Intergrowths of Feldspars with Other Minerals. In: Feldspar Minerals. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-72594-4_20
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DOI: https://doi.org/10.1007/978-3-642-72594-4_20
Publisher Name: Springer, Berlin, Heidelberg
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