Simple Lithology
fine grained igneous rock
http://resource.geosciml.org/classifier/cgi/lithology/fine_grained_igneous_rock
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alt label |
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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. |  |
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narrower |
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note | Need to make decision as to whether devitrified glass should be considered glass or microcrystalline framework for purposes of categorization | |
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source | Gillespie and Styles 1999; LeMaitre et al. 2002 | |
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type |
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broader |
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in scheme | simplelithology | |||||||||||||||||||||||||||||||||||||
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is primary topic of | fine grained igneous rock& properties=type | |||||||||||||||||||||||||||||||||||||