( ( crystal purveyors ) ( ( describe ( the minerals ) ) ; ) )
(ROOT (S (NP (NN crystal) (NNS purveyors)) (VP (VBP describe) (NP (DT the) (NNS minerals))) (: ;)))
crystal purveyors describe the minerals;
(ROOT (S (NP (DT A) (NN mineral)) (VP (VBZ is) (VP (VBN described) (PP (IN as) (NP (NP (DT a) (JJ solid) (JJ natural) (NN material)) (PP (IN with) (NP (DT a) (NN crystal) (NN structure))))))) (. .)))