Simple Lithology

fine grained igneous rock

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

alt label
volcanic rock more like this
definition Igneous rock in which the framework of the rock consists of crystals that are too small to determine mineralogy with the unaided eye; framework may include up to 50 percent glass. A significant percentage of the rock by volume may be phenocrysts. Includes rocks that are generally called volcanic rocks. more like this
narrower andesite
broader fine grained igneous rock
basalt
broader fine grained igneous rock
dacite
broader fine grained igneous rock
foiditoid
broader fine grained igneous rock
high magnesium fine grained igneous rocks
broader fine grained igneous rock
phonolitoid
broader fine grained igneous rock
rhyolitoid
broader fine grained igneous rock
tephritoid
broader fine grained igneous rock
trachytoid
broader fine grained igneous rock
note Need to make decision as to whether devitrified glass should be considered glass or microcrystalline framework for purposes of categorization more like this
source Gillespie and Styles 1999; LeMaitre et al. 2002 more like this
type
Resource
Concept
broader igneous rock
narrower fine grained igneous rock
in scheme simplelithology
is primary topic of fine grained igneous rock