( This ( ( produces ( ( a ( ( void or ) mold ) ) ( which ( ( is then ) ( filled ( by ( deposition ( of ( quartz ( or ( other minerals ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ produces) (NP (NP (DT a) (NN void) (CC or) (NN mold)) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADVP (RB then)) (VP (VBN filled) (PP (IN by) (NP (NP (NN deposition)) (PP (IN of) (NP (NN quartz) (CC or) (JJ other) (NNS minerals))))))))))) (. .)))
This produces a void or mold which is then filled by deposition of quartz or other minerals.
(ROOT (S (NP (DT The) (NN mineral) (NN quartz)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB produce) (NP (NN glass))))))) (. .)))