Simple Lithology

anorthositic rock

definition Leucocratic phaneritic crystalline igneous rock consisting essentially of plagioclase, often with small amounts of pyroxene. By definition, colour index M is less than 10, and plagiclase to total feldspar ratio is greater than 0.9. Less than 20 percent quartz and less than 10 percent feldspathoid in the QAPF fraction. QAPF field 10, 10*, and 10'. more like this
narrower anorthosite
broader anorthositic rock
foid bearing anorthosite
broader anorthositic rock
quartz anorthosite
broader anorthositic rock
note Anorthositic rock term invented to label the combined QAPF fields 10, 10*, and 10', in order to construct hierarchy in this vocabulary. more like this
source LeMaitre et al. 2002; This vocabulary more like this
broader phaneritic igneous rock
narrower anorthositic rock
in scheme simplelithology
is primary topic of anorthositic rock