Quartz Syenite Hand Sample
Thin Section Missing

Quartz Syenite

IUGS Definition ( QAPF Chart )

Quartz Syenite: "A plutonic rock consisting essentially of alkali feldspar, quartz and mafic minerals."
Photos
Chemistry
Typical Minerals
  • alkali feldspar: perthitic orthoclase and microcline
  • plagioclase feldspar, often as perthitic components
  • biotite
  • clinopyroxene: diopside, augite
  • amphibole
  • quartz (5%-20% of total felsic minerals
  • accessory minerals: sphene, apatite, zircon, opaque oxides, olivine