Found 2 items, similar to pyrolusite.
English → English (WordNet) Definition: pyrolusite pyrolusite n : a mineral consisting of manganese dioxide; an important source of manganese
English → English (gcide) Definition: Pyrolusite Pyrolusite \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). [1913 Webster]