( Plagioclase ( ( is ( ( concentrated ( in ( igneous rocks ) ) ) ( from ( the ( oceanic crust ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Plagioclase)) (VP (VBZ is) (VP (VBN concentrated) (PP (IN in) (NP (JJ igneous) (NNS rocks))) (PP (IN from) (NP (DT the) (JJ oceanic) (NN crust))))) (. .)))
Plagioclase is concentrated in igneous rocks from the oceanic crust .
(ROOT (S (NP (NNP Gabbro)) (VP (VBZ is) (NP (NP (DT a) (JJ dark) (JJ dense) (NN rock)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (VP (VB be) (VP (VBN found) (PP (IN in) (NP (DT the) (JJ oceanic) (NN crust)))))))))) (. .)))
Gabbro is a dark dense rock that can be found in the oceanic crust.