Foid Monzodiorite Hand Sample
Foid Monzodiorite Thin Section

Foid Monzodiorite

IUGS Definition ( QAPF Chart )( FAP Chart )

Foid Monzodiorite: "A collective term for alkaline plutonic rocks consisting of feldspathoids (10%-60% of the felsic minerals), intermediate plagioclase with subordinate alkali feldspar and large amounts of mafic minerals."
Photos
Typical Minerals
  • feldspathoids
  • intermediate plagioclase: andesine or calcic oligoclase
  • alkali feldspar
  • biotite
  • pyroxene
  • hornblende