The Plagioclase feldspars.(Lets Get It Right)

From: Rocks & Minerals | Date: July 1, 2006| Author: White, John S. | Copyright information

For nearly all of my professional life the plagioclase feldspars had been divided into what have long been considered six distinct species (see table). I have always found this convention useful, even if the division was acknowledged as arbitrary. It was useful because, in general, "most anorthite occurs in contact-metamorphosed limestone; bytownite and labradorite are characteristic of igneous rocks of gabbroic composition and of anorthosites; andesine of andesites and diorites; o...

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