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perthite

[pur-thahyt]

noun Mineralogy.

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

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019