( ( C. Composition ) ( of ( rock ( or ( mineral substance ) ) ) ) )
(ROOT (NP (NP (NNP C.) (NNP Composition)) (PP (IN of) (NP (NN rock) (CC or) (NN mineral) (NN substance)))))
C. Composition of rock or mineral substance
(ROOT (S (NP (DT A) (NN mineral)) (VP (VBZ is) (VP (VBN described) (PP (IN as) (NP (NP (DT a) (JJ natural) (NN substance)) (SBAR (WHNP (WDT that)) (S (VP (VBZ makes) (PRT (RP up)) (NP (NNS rocks))))))))) (. .)))