Alkali feldspar

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  1. Those feldspars composed of mixtures or crystal solutions of potassium feldspar, KAlSi3 O8 , and sodium feldspar, NaAlSi3 O 8 , with little or no calcium feldspar, CaAl2 Si2 O 8 .
  2. The subgroup of the feldspar group including albite, anorthoclase, microcline, orthoclase, and sanidine. Syn: alkalic feldspar CF: plagioclase
    Source: Dictionary of Mining, Mineral, and Related Terms


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