Simple Lithology

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 boninite
broader high magnesium fine grained igneous rocks
komatiitic rock
broader high magnesium fine grained igneous rocks
source LeMaitre et al. 2002 more like this
type
Resource
Concept
broader fine grained igneous rock
narrower high magnesium fine grained igneous rocks
in scheme simplelithology
is primary topic of high magnesium fine grained igneous rocks