perthite [pur-thahyt] Word Origin noun Mineralogy.

  1. a variety of feldspar containing irregular bands of albite in microcline.

Origin of perthite 1832; named after Perth, Ontario, Canada; see -ite1 Related formsper·thit·ic [per-thit-ik] /pərˈθɪt ɪk/, adjectiveper·thit·i·cal·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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