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.