anorthite(redirected from anorthitic)
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Related to anorthitic: labradorite
anorthite(ănôr`thīt): see feldsparfeldspar
, an abundant group of rock-forming minerals which constitute 60% of the earth's crust. Chemically the feldspars are silicates of aluminum, containing sodium, potassium, iron, calcium, or barium or combinations of these elements.
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The white, grayish, or reddish calcium-rich end member of the plagioclase feldspar series; composition ranges from Ab10 An90 to Ab0 An100, where Ab = NaAlSi3O8 and An = CaAl2Si2O8. Also known as calciclase; calcium feldspar.