Item talk:Q158202: Difference between revisions
From geokb
(Updated rock class item discussion page with longer source data descriptions) |
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Igneous rock in which the framework of the rock consists of crystals that are too small to determine mineralogy with the unaided eye. | Igneous rock in which the framework of the rock consists of crystals that are too small to determine mineralogy with the unaided eye. | ||
= Geoscience Ontology Description = | = Geoscience Ontology Description = | ||
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. | |||
Need to make decision as to whether devitrified glass should be considered glass or microcrystalline framework for purposes of categorization | Need to make decision as to whether devitrified glass should be considered glass or microcrystalline framework for purposes of categorization | ||
Revision as of 15:24, 24 October 2023
Mindat Description
Igneous rock in which the framework of the rock consists of crystals that are too small to determine mineralogy with the unaided eye.
Geoscience Ontology Description
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.
Need to make decision as to whether devitrified glass should be considered glass or microcrystalline framework for purposes of categorization
