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alkali feldspar trachyte

definition Trachytoid that has a plagioclase to total feldspar ratio less than 0.1, between 0 and 5 percent quartz in the QAPF fraction, and no feldspathoid minerals. QAPF field 6. more like this
source LeMaitre et al. 2002 more like this
Resource original
Concept original
broader original
narrower alkali_feldspar_trachyte original
in scheme simplelithology original
is primary topic of alkali_feldspar_trachyte