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Definition of: pyrolusite
(pī′rə·l
′sīt, pī·rol′yə·sīt) noun
A soft, metallic, iron–black or steel–gray manganese dioxide, MnO2, of great value in the arts, and used in the manufacture of oxygen, chlorine, etc. [<G pyrolusit <Gk. pyr, pyros a fire + lousis a washing (<louein wash) + G -it -ITE1]
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