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dacite

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

broader

http://resource.geosciml.org/classifier/cgi/lithology/acidic_igneous_rock original
narrower	dacite original

http://resource.geosciml.org/classifier/cgi/lithology/fine_grained_igneous_rock original
narrower	dacite original

definition

Fine grained or porphyritic crystalline rock that contains less than 90 percent mafic minerals, between 20 and 60 percent quartz in the QAPF fraction, and has a plagioclase to total feldspar ratio greater than 0.65. Includes rocks defined modally in QAPF fields 4 and 5 or chemically in TAS Field O3. Typcially composed of quartz and sodic plagioclase with minor amounts of biotite and/or hornblende and/or pyroxene; fine-grained equivalent of granodiorite and tonalite.

example

rhyodacite

source

LeMaitre et al. 2002

type

Resource original
Concept original

in scheme

simplelithology original

is primary topic of

dacite