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.)

Sources Checked for Data in Record

  • Submitted information Comment: José Delgado Rodrigues, LNEC, 2009.

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