( ( ( Sand-sized particles ) ( of quartz ) ) ( ( used ( ( ( in ( ( the manufacture ) ( of glass ) ) ) and ) ( in polishing ) ) ) . ) )
(ROOT (S (NP (NP (JJ Sand-sized) (NNS particles)) (PP (IN of) (NP (NN quartz)))) (VP (VBD used) (PP (PP (IN in) (NP (NP (DT the) (NN manufacture)) (PP (IN of) (NP (NN glass))))) (CC and) (PP (IN in) (NP (VBG polishing))))) (. .)))
Sand-sized particles of quartz used in the manufacture of glass and in polishing.
(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))))))) (. .)))