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1. (n.) pyrolusite
a grayish black mineral, manganese dioxide, MnO
Etymology: (1820–30; pyro - + Gk loûs(is) washing + -ite1)
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| Definition of 'pyrolusite' |
Princeton's WordNet |
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1. (noun) pyrolusite
a mineral consisting of manganese dioxide; an important source of manganese
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| Definition of 'pyrolusite' |
Webster Dictionary |
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1. (noun) pyrolusite
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)
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Definitions of pyrolusite 
