Simple Lithology

trachytoid

http://resource.geosciml.org/classifier/cgi/lithology/trachytoid

definition Fine grained igneous rock than contains less than 90 percent mafic minerals, less than 10 percent feldspathoid mineral and less than 20 percent quartz in the QAPF fraction and has a plagioclase to total feldspar ratio less than 0.65. Mafic minerals typically include amphibole or mica; typically porphyritic. Includes rocks defined modally in QAPF fields 6, 7 and 8 (with subdivisions) or chemically in TAS Field T as trachyte or latite. more like this
example
basaltic-trachyandesite more like this
benmoreite more like this
hawaiite more like this
mugearite more like this
potassic-trachybasalt more like this
shoshonite more like this
trachyandesite more like this
trachybasalt more like this
trachydacite more like this
trachyte(TAS) more like this
narrower alkali feldspar trachytic rock
broader trachytoid
latitic rock
broader trachytoid
trachytic rock
broader trachytoid
source LeMaitre et al. 2002 more like this
type
Resource
Concept
broader fine grained igneous rock
narrower trachytoid
in scheme simplelithology
is primary topic of trachytoid