trachyte

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

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

trachyte (countable and uncountable, plural trachytes)

1. (geology) 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.

• trachytic
• trachytoid

• chattery, ratchety