Foid Monzosyenite Hand Sample
Foid Monzosyenite Thin Section

Foid Monzosyenite

IUGS Definition ( QAPF Chart )( FAP Chart )

Foid Monzosyenite: "A collective term for rare alkaline plutonic rocks consisting of feldspathoids, alkali feldspar, plagioclase and mafic minerals. The term is synonymous with foid plagisyenite."
Photos
Typical Minerals
  • alkali feldspar: perthitic orthoclase and microcline
  • plagioclase feldspar
  • feldspathoid minerals
  • hornblende
  • biotite
  • accessory minerals: sphene, apatite, zircon, opaque oxides, clinopyroxene