Anorthite

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  1. Feldspar in which diagnostic positive ion is Ca2+; calcic feldspar, Ca(Al2Si2O8). One of plagioclase feldspars.
    Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
  2. A triclinic mineral, 4[CaAl2 Si2 O8 ] ; plagioclase series of the feldspar group, with up to 10 mol % NaSi replacing CaAl; white to gray; in ultramafic intrusive igneous bodies and skarns. Syn: calcium feldspar; calcium plagioclase; calciclase; lepolite.
  3. A pure calcium end member of the plagioclase series.
    Source: Dictionary of Mining, Mineral, and Related Terms


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