( ( ( ( ( Rock phosphate ) , ) ( a ( natural ( mineral powder ) ) ) ) , ) ( ( is ( another ( good addition ) ) ) . ) )
(ROOT (S (NP (NP (NNP Rock) (NNP phosphate)) (, ,) (NP (DT a) (JJ natural) (NN mineral) (NN powder)) (, ,)) (VP (VBZ is) (NP (DT another) (JJ good) (NN addition))) (. .)))
Rock phosphate, a natural mineral powder, is another good addition.
(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))))))))) (. .)))