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An intergrowth of a sodic and a potassic feldspar, generally considered to have formed during slow cooling by the unmixing of sodium and potassium ions in an originally homogeneous alkalic feldspar. In an antiperthite, the potassic member (usually orthoclase) forms thin films, lamellae, strings, or irregular veinlets, within the sodic member (usually albite). CF: perthite
Source: Dictionary of Mining, Mineral, and Related Terms

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