Simple Lithology
phonolitoid
http://resource.geosciml.org/classifier/cgi/lithology/phonolitoid
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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. |  |
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narrower |
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source | LeMaitre et al. 2002 | |
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in scheme | simplelithology | |||||||||
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is primary topic of | phonolitoid& properties=definition | |||||||||