( ( By contrast ) ( , ( ( the ( volcaniclastic component ) ) ( ( consists ( of ( ( ( brown ( and ( colorless ( glass shards ) ) ) ) , ) ( crystals ( of ( plagioclase ( , ( quartz ( , ( biotite ( , ( amphibole ( , ( pyroxene ( , ( and ( opaque minerals ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN By) (NP (NN contrast))) (, ,) (NP (DT the) (JJ volcaniclastic) (NN component)) (VP (VBZ consists) (PP (IN of) (NP (NP (JJ brown) (CC and) (JJ colorless) (NN glass) (NNS shards)) (, ,) (NP (NP (NNS crystals)) (PP (IN of) (NP (NN plagioclase) (, ,) (NN quartz) (, ,) (NN biotite) (, ,) (NN amphibole) (, ,) (NN pyroxene) (, ,) (CC and) (NN opaque) (NNS minerals))))))) (. .)))
By contrast, the volcaniclastic component consists of brown and colorless glass shards, crystals of plagioclase, quartz, biotite, amphibole, pyroxene, and opaque minerals.
(ROOT (S (NP (DT The) (NN mineral) (NN quartz)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB produce) (NP (NN glass))))))) (. .)))