Concept
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- Preferred Labelskos:prefLabel
rhyolitoid
- URI
- http://resource.geosciml.org/classifier/cgi/lithology/rhyolitoid ↗Go to the persistent identifier link
- Within Vocab
- Simple Lithology
| Preferred Labelskos:prefLabel | rhyolitoid |
|---|---|
| Definitionskos:definition | fine_grained_igneous_rock consisting of quartz and alkali feldspar, with minor plagioclase and biotite, in a microcrystalline, cryptocrystalline or glassy groundmass. Flow texture is common. Includes rocks defined modally in QAPF fields 2 and 3 or chemically in TAS Field R as rhyolite. QAPF normative definition is based on modal mineralogy thus: less than 90 percent mafic minerals, between 20 and 60 percent quartz in the QAPF fraction, and ratio of plagioclse to total feldspar is less than 0.65. |
| Exact MatchexactMatch |
http://inspire.ec.europa.eu/codelist/LithologyValue/rhyolitoid
|
| Narrowernarrower |
alkali feldspar rhyolite
rhyolite |
| Broaderbroader |
acidic igneous rock
fine grained igneous rock |
| See AlsoseeAlso | Simple Lithology |
| Alternative LabelaltLabel | rhyolitic rock |
| Notenote | Note that technical definition, based on modal mineralogy plotted in a QAPF triangle may be applied qualitatively, based on phenocryst mineralogy when ground mass mineralogy can not be determined optically, or based on CIPW norm. Although TAS categories are defined based on chemical analyses, the correspondence with the QAPF defined categories is generally close enough that QAPF categories are commonly used interchangeably with TAS categories. It is important to note the basis for assignment of fine-grained igneous rocks to a specifice lithology category. |
| Is Defined ByisDefinedBy | Simple Lithology |