Granite Hand Sample
Granite Thin Section

Granite

IUGS Definition ( QAPF Chart ) ( QAP Chart )

Granite: A plutonic rock with quartz > 20% QAP, alkali feldspar > 35% of feldspar, and plagioclase.
Photos
Typical Minerals
  • quartz (> 20%)
  • alkali feldspar: microcline, orthoclase, or perthite (> 35% of feldspar)
  • plagioclase
  • hornblende and/or biotite, or muscovite and biotite
  • Accessory minerals: apatite, zircon, monazite