( ( Impregnated ( ( Rocks or ) minerals ) ) ( ( saturated ( with ( some ( other substance ) ) ) ) . ) )
(ROOT (S (NP (JJ Impregnated) (NNS Rocks) (CC or) (NNS minerals)) (VP (VBD saturated) (PP (IN with) (NP (DT some) (JJ other) (NN substance)))) (. .)))
Impregnated Rocks or minerals saturated with some other 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))))))))) (. .)))