( ( STREAK Streak ) ( ( is ( ( the color ) ( of ( ( a mineral ) ( when ( it ( is powdered ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP STREAK) (NNP Streak)) (VP (VBZ is) (NP (NP (DT the) (NN color)) (PP (IN of) (NP (NP (DT a) (NN mineral)) (SBAR (WHADVP (WRB when)) (S (NP (PRP it)) (VP (VBZ is) (ADJP (JJ powdered))))))))) (. .)))
STREAK Streak is the color of a mineral when it is powdered.
(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)))) (. .)))