Simple Lithology

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phonolitoid

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

alt label

phonolitic rock

definition

Fine grained igneous rock than contains less than 90 percent mafic minerals, between 10 and 60 percent feldspathoid mineral in the QAPF fraction and has a plagioclase to total feldspar ratio less than 0.5. Includes rocks defined modally in QAPF fields 11 and 12, and TAS field Ph.

narrower

phonolilte

broader	phonolitoid

tephritic phonolite

broader	phonolitoid

source

LeMaitre et al. 2002

type

Resource
Concept

broader

fine grained igneous rock

narrower	phonolitoid

in scheme

simplelithology

is primary topic of

phonolitoid