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definition Phaneritic crystalline igneous rock that contains less than 90 percent mafic minerals, and up to 20 percent quartz or up to 10 percent feldspathoid in the QAPF fraction. The ratio of plagioclase to total feldspar is greater than 0.65, and anorthite content of the plagioclase is greater than 50 percent. Includes rocks defined modally in QAPF fields 9 and 10 and their subdivisions. more like this
narrower original
broader gabbroid original original
broader gabbroid original
source LeMaitre et al. 2002 more like this
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narrower gabbroid original
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is primary topic of gabbroid