( ( Among minerals ) ( ( ( flint and ) quartz ) ( ( was ( ( used ( the most ) ) ( for ( making ( cutting tools ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN Among) (NP (NNS minerals))) (NP (NN flint) (CC and) (NN quartz)) (VP (VBD was) (VP (VBN used) (NP (DT the) (JJS most)) (PP (IN for) (S (VP (VBG making) (NP (VBG cutting) (NNS tools))))))) (. .)))
Among minerals flint and quartz was used the most for making cutting tools.
(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))))))) (. .)))