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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 original
broader foid_dioritoid original original
broader foid_dioritoid original
source LeMaitre et al. 2002 more like this
Resource original
Concept original
broader original
narrower foid_dioritoid original
in scheme simplelithology original
is primary topic of foid_dioritoid