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perthite

American  
[pur-thahyt] / ˈpɜr θaɪt /

noun

Mineralogy.

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

Other Word Forms

  • perthitic adjective
  • perthitically adverb

Etymology

Origin of perthite

1832; named after Perth, Ontario, Canada; see -ite 1

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Potassium feldspar does not exhibit twinning or striations but may show linear features called exsolution lamellae, also known as perthitic lineation or simply perthite.

From Textbooks • Jan. 1, 2017

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.