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doc Definition of pyrolusite
    English to English
    noun
  • a mineral consisting of manganese dioxide; an important source of manganese
  • source: WordNet 3.0
  • 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 1913
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