trachyte

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English[edit]

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Etymology[edit]

From French trachyte, from Ancient Greek τρᾱχύς (trākhús, rough).

Pronunciation[edit]

  • (UK) IPA(key): /ˈtɹeɪkʌɪt/, /ˈtɹakʌɪt/

Noun[edit]

trachyte (plural trachytes)

  1. (geology, mineralogy) A pale igneous rock consisting mostly of potassium feldspar and plagioclase.
    • 2004, Richard Fortey, The Earth, Folio Society 2011, p. 52:
      The type of rock that results is often described as trachyte and contains abundant crystals of a different kind of alkali-rich feldspar, such as sanidine, rather than plagioclase.

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