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Economic Geology; August 1983; v. 78; no. 5; p. 854-874
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Sequence of mineral assemblages in differentiated granitic pegmatites

James J. Norton

U. S. Geol. Surv., Denver, CO, United States

Revised sequence is (1) plagioclase, quartz, muscovite, (2) plagioclase, quartz, (3) quartz, perthite, plagioclase, (4) perthite, quartz, (5) quartz, plagioclase, perthite, spodumene (or petalite), amblygonite, (6) quartz, spodumene (or petalite), (7) quartz, microcline or perthite, (8) quartz, and (9) lepidolite or lithian mica, plagioclase, quartz, microcline.--Modified journal abstract.

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