Simple Lithology

foid dioritoid

definition Phaneritic crystalline igneous rock in which M is less than 90, the plagioclase to total feldspar ratio is greater than 0.5, feldspathoid minerals form 10-60 percent of the QAPF fraction, plagioclase has anorthite content less than 50 percent. These rocks typically contain large amounts of mafic minerals. Includes rocks defined modally in QAPF fields 13 and 14. more like this
narrower foid diorite
broader foid dioritoid
foid monzodiorite
broader foid dioritoid
source LeMaitre et al. 2002 more like this
broader phaneritic igneous rock
narrower foid dioritoid
in scheme simplelithology
is primary topic of foid dioritoid