Granodiorite Hand Sample
Granodiorite Thin Section

Granodiorite

IUGS Definition ( QAPF Chart )

Granodiorite: “A plutonic rock consisting essentially of quartz, sodic plagioclase and lesser amounts of alkali feldspar with minor amounts of hornblende and biotite. Name first used by Becker on maps of the Gold Belt of the Sierra Nevada.”
Photos
Typical Minerals
  • plagioclase
  • alkali feldspar
  • quartz
  • hornblende
  • biotite
  • muscovite