Simple Lithology

glassy igneous rock

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

unstar this property definition Igneous rock that consists of greater than 80 percent massive glass. more like this
star this property history note Change percent criteria from 90 to 80 percent for version 2009. more like this
star this property note Note that this category is used for massive glassy rocks. Much of the pyroclastic material in a pyroclastic rock may be composed of glass, but the rock is named based on its fragmental nature. more like this
star this property source This vocabulary more like this
star this property type
Resource
Concept
star this property broader glass rich igneous rock
star this property narrower glassy igneous rock
star this property in scheme simplelithology
star this property is primary topic of glassy igneous rock& properties=definition