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pyrolusite
CIDE DICTIONARY
pyrolusite, n. [Pyro- + Gr. to loose, or a loosing.].
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). [1913 Webster]
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