( ( The streak ) ( ( is ( ( a way ) ( of ( checking ( ( the color ) ( of ( ( a ( mineral 's ) ) powder ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN streak)) (VP (VBZ is) (NP (NP (DT a) (NN way)) (PP (IN of) (S (VP (VBG checking) (NP (NP (DT the) (NN color)) (PP (IN of) (NP (NP (DT a) (NN mineral) (POS 's)) (NN powder))))))))) (. .)))
The streak is a way of checking the color of a mineral's powder.
(ROOT (S (NP (NP (DT The) (NN color)) (PP (IN of) (NP (NP (DT the) (NN powder)) (PP (IN of) (NP (DT a) (NN mineral)))))) (VP (VBZ is) (VP (VBN called) (NP (NN streak)))) (. .)))