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PREFERRED TERM
phonolitoid
TYPE
  • http://purl.org/net/provenance/ns#DataItem

DEFINITION
  • Fine grained igneous rock than contains less than 90 percent mafic minerals, between 10 and 60 percent feldspathoid mineral in the QAPF fraction and has a plagioclase to total feldspar ratio less than 0.5. Includes rocks defined modally in QAPF fields 11 and 12, and TAS field Ph.

DESCRIPTION
  • Fine grained igneous rock than contains less than 90 percent mafic minerals, between 10 and 60 percent feldspathoid mineral in the QAPF fraction and has a plagioclase to total feldspar ratio less than 0.5. Includes rocks defined modally in QAPF fields 11 and 12, and TAS field Ph.

IDENTIFIER
  • phonolitoid

TITLE
  • phonolitoid

URI
http://inspire.ec.europa.eu/codelist/LithologyValue/phonolitoid
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