English dictionary
pyrolusite
Definitions, examples, synonyms and antonyms from WordNet 3.0.
noun
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a mineral consisting of manganese dioxide; an important source of manganese
Source: WordNet 3.0
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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: webster1913