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high magnesium fine grained igneous rock

http://resource.geosciml.org/classifier/cgi/lithology/high_magnesium_fine_grained_igneous_rocks

definition fine-grained igneous rock that contains unusually high concentration of MgO. For rocks that contain greater than 52 percent silica, MgO must be greater than 8 percent. For rocks containing less than 52 percent silica, MgO must be greater than 12 percent. more like this
example
boninite more like this
picrite more like this
narrower
http://resource.geosciml.org/classifier/cgi/lithology/boninite original
broader high_magnesium_fine_grained_igneous_rocks original
http://resource.geosciml.org/classifier/cgi/lithology/komatiitic_rock original
broader high_magnesium_fine_grained_igneous_rocks original
source LeMaitre et al. 2002 more like this
type
Resource original
Concept original
broader
http://resource.geosciml.org/classifier/cgi/lithology/fine_grained_igneous_rock original
narrower high_magnesium_fine_grained_igneous_rocks original
in scheme simplelithology original
is primary topic of high_magnesium_fine_grained_igneous_rocks