Tephritic Phonolite Hand Sample
Tephritic Phonolite Thin Section

Tephritic Phonolite

IUGS Definition ( QAPF Chart )

Tephritic Phonolite: “A collective term for alkaline volcanic rocks consisting of alkali feldspar, sodic plagioclase, feldspathoid and various mafic minerals.”
Typical Minerals
  • sanidine
  • leucite
  • clinopyroxene
  • plagioclase