( ( Crystal ( chemistry ( and ( mineral structures ) ) ) ) . )
(ROOT (S (VP (VB Crystal) (NP (NN chemistry) (CC and) (NN mineral) (NNS structures))) (. .)))
Crystal chemistry and mineral structures.
(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))))))) (. .)))