different between trachytic vs trachyte

English

trachyte +? -ic

trachytic (not comparable)

From French trachyte, from Ancient Greek ?????? (tr?khús, “rough”).

trachyte (countable and uncountable, plural trachytes)

(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.

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