Pyr`o*lu"site (?), n. [Pyro- + Gr. to loose, or a loosing.] Min.

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).


© Webster 1913.

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