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foid syenitoid

definition Phaneritic crystalline igneous rock with M less than 90, contains between 10 and 60 percent feldspathoid mineral in the QAPF fraction, and has a plagioclase to total feldspar ratio less than 0.5. Includes QAPF fields 11 and 12. more like this
narrower original
broader foid_syenitoid original original
broader foid_syenitoid original
source LeMaitre et al. 2002 more like this
Resource original
Concept original
broader original
narrower foid_syenitoid original
in scheme simplelithology original
is primary topic of foid_syenitoid