Simple Lithology

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
broader alkali feldspar trachytic rock
narrower alkali feldspar trachyte
in scheme simplelithology
is primary topic of alkali feldspar trachyte