Simple Lithology


definition Phaneritic crystalline igneous rock with M less than 90, consisting mainly of alkali feldspar and plagioclase; minor quartz or nepheline may be present, along with pyroxene, amphibole or biotite. Ratio of plagioclase to total feldspar is less than 0.65, quartz forms less than 20 percent of QAPF fraction, and feldspathoid minerals form less than 10 percent of QAPF fraction. Includes rocks classified in QAPF fields 6, 7 and 8 and their subdivisions. more like this
narrower alkali feldspar syenitic rock
broader syenitoid
monzonitic rock
broader syenitoid
syenitic rock
broader syenitoid
source LeMaitre et al. 2002 more like this
broader phaneritic igneous rock
narrower syenitoid
in scheme simplelithology
is primary topic of syenitoid