Simple Lithology

fine grained igneous rock

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

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volcanic rock more like this
star this property 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
star this property narrower andesite
star this property broader fine grained igneous rock
basalt
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dacite
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foiditoid
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high magnesium fine grained igneous rocks
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phonolitoid
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rhyolitoid
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tephritoid
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trachytoid
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star this property note Need to make decision as to whether devitrified glass should be considered glass or microcrystalline framework for purposes of categorization more like this
star this property source Gillespie and Styles 1999; LeMaitre et al. 2002 more like this
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Resource
Concept
star this property broader igneous rock
star this property narrower fine grained igneous rock
star this property in scheme simplelithology
unstar this property is primary topic of fine grained igneous rock& properties=isPrimaryTopicOf,prefLabel