- https://data.geoscience.earth/ncl
- INSPIRE
- LithologyValue
- _2d26e82d-f6e9-4d88-923d-f0919b3fb910
experimental
Entry: rhyolitoid
URI: http://inspire.ec.europa.eu/codelist/LithologyValue/rhyolitoid
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.
Core metadata
| is a | Concept |
| submitted by | Sophie Chaduteau |
| accepted on | 16 Jul 2026 11:53:11.089 |
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All metadata properties
| date accepted |
16 Jul 2026 11:53:11.089
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| date submitted |
16 Jul 2026 09:17:49.919
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| definition |
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| item class |
Concept
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| label |
rhyolitoid
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| notation |
2d26e82d-f6e9-4d88-923d-f0919b3fb910
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| register |
lithology value
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| status |
status experimental
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| submitter |
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| type |
register item
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| version info |
2
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Definition
| broader |
acidic igneous rock
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| 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.
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| narrower |
rhyolite
| alkali feldspar rhyolite
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| notation |
rhyolitoid
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| pref label |
rhyolitoid
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| type |
Concept
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