Simple Lithology

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dacite

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

broader

acidic igneous rock

narrower	dacite

fine grained igneous rock

narrower	dacite

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
Concept

in scheme

simplelithology

is primary topic of

dacite