Alkali feldspar

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A group of Feldspar minerals that are rich in the Alkali elements of Potassium and Sodium. Alkali-rich feldspars are: Microcline, Orthoclase, Anorthoclase, Sanidine, and Albite. They contain less than 5% Anorthite.

Synonyms and Related Terms

feldspath alcalin (Fr.); feldspato alcalino (Port.)

Resources and Citations

  • José Delgado Rodrigues, LNEC, 2009, submitted information.