antiperthite

antiperthite

[‚an·ti′pər‚thīt]
(geology)
Natural intergrowth of feldspars formed by separation of sodium feldspar (albite) and potassium feldspar (orthoclase) during slow cooling of molten mixtures; the potassium-rich phase is evolved in a plagioclase host, exactly the inverse of perthite.
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References in periodicals archive ?
1990) Davis Hill, Ontario, an occurrence of large nepheline, biotite and antiperthite crystals in calcite-cored vein dykes.