Dacite Hand Sample
Dacite Thin Section

Dacite

IUGS Definition ( QAPF Chart )

Dacite: “A volcanic rock composed of quartz and sodic plagioclase with minor amounts of biotite and/or hornblende and/or pyroxene. The volcanic equivalent of granodiorite and tonalite.”
Photos
Typical Minerals
  • plagioclase
  • quartz
  • biotite
  • hornblende