Gabbroid - definition of gabbroid by The Free Dictionary
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n. pl. gab·bros
A usually coarse-grained igneous rock composed chiefly of pyroxene and calcic plagioclase feldspar. Also called norite.
[Italian, perhaps from Latin glaber, bald, beardless.]
gab·bro′ic (gă-brō′ĭk), gab′broid′ (găb′roid′) adj.
gabbro-like, esp of a rock in the petrographic clan which contains the gabbro family
References in periodicals archive
One of these, a medium-grained gabbroid
, contains up to 3 cm long phenocrysts of plagioclase.
Unit G is composed of sparsely to moderately porphyritic basalt, with gabbroid
xenoliths, plagioclase glomerocrysts and olivine microphenocrysts.
Pegmatoid and gabbroid
layers in Jurassic Preakness and Hook Mountain basalts, Newark Basin, New Jersey.