INSPIRE
Registry

syenitoid

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Label:
syenitoid
Definition:
Phaneritic crystalline igneous rock with M less than 90, consisting mainly of alkali feldspar and plagioclase; minor quartz or nepheline may be present, along with pyroxene, amphibole or biotite. Ratio of plagioclase to total feldspar is less than 0.65, quartz forms less than 20 percent of QAPF fraction, and feldspathoid minerals form less than 10 percent of QAPF fraction. Includes rocks classified in QAPF fields 6, 7 and 8 and their subdivisions.
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Label Governance level Status
alkali feldspar syenitic rock eu-technical Valid
monzonitic rock eu-technical Valid
syenitic rock eu-technical Valid