How do you identify alkali feldspar in a thin section?
By Perrine Juillion / May 31, 2019. In thin sections, alkali feldspars are colorless and can be identified by their cleavage, low relief, and low birefringence. A great variety of twin types such as Carlsbad, albite, Pericline, or polysynthetic tartan twinning also are useful in their identification.
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