Bushveld Complex Anorthosite
Anorthosite Thin Section

Anorthosite

IUGS Definition ( QAPF Chart )( QAP Chart )

Anorthosite: "A leucrocratic plutonic rock consisting essentially of plagioclase often with small amounts of pyroxene. The term is synonymous with plagioclasite."
Photos
Typical Minerals
  • primarily calcic plagioclase feldspar: anorthite, bytownite, or labradorite
  • small amounts of pyroxenes (less than 10%)
  • quartz (less than 5%)
  • accessory minerals: olivine, ilmenite, magnetite