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Pyrolusite

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Definitions of Pyrolusite
Pronunciation : Pyr`o*lu"site
Part of Speech : n.
Etymology : [Pyro- + Gr. (Min.)
Definition : Defn: Manganese dioxide, a mineral of an iron-black or dark steel- gray color and metallic luster, usually soft. Pyrolusite parts with its oxygen at a red heat, and is extensively used in discharging the brown and green tints of glass (whence its name).
Source : Webster's Unabridged Dictionary, 1913

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