/puy'reuh looh"suyt, puy rol"yeuh suyt'/, n.
a common mineral, manganese dioxide, MnO2, the principal ore of manganese, used in various manufactures, as a decolorizer of brown or green tints in glass, and as a depolarizer in dry-cell batteries.
[1820-30; PYRO- + Gk loûs(is) washing + -ITE1]

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      common manganese mineral, manganese dioxide (MnO2), that constitutes an important ore. Always formed under highly oxidizing conditions, it forms light-gray to black, metallic, moderately heavy coatings, crusts, or fibres that are alteration products of other manganese ores (e.g., rhodochrosite); bog, lake, or shallow marine products; or deposits left by circulating waters. It is mined in Germany, Brazil, India, the United States, Cuba, Morocco, Ghana, and South Africa. Pyrolusite is used in the manufacture of steel and manganese bronze; in dry cells; and as a decolorizing agent in glass. For detailed physical properties, see oxide mineral (table).

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Universalium. 2010.

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  • PYROLUSITE — De formule Mn2, la pyrolusite est un oxyde naturel de manganèse. Elle est une pseudomorphose de l’acerdèse MnO(OH) dont elle dérive par déshydratation, le minéral devenant friable et tachant les doigts de noir. La pyrolusite s’observe en masses… …   Encyclopédie Universelle

  • 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 …   The Collaborative International Dictionary of English

  • pyrolusite — manganese dioxide, the name given in Roman times, when it was used, in a heated state, to decolorize glass, from Greek elements pyro by heat, by fire (see PYRO (Cf. pyro )) + lysis a loosening (see LOSE (Cf. lose)) …   Etymology dictionary

  • pyrolusite — [pī΄rō lo͞o′sīt΄, pī räl′yo͞osīt΄] n. [Ger pyrolusit < Gr pyr, FIRE + lousis, a washing (< louein, to wash < IE base * lou , to wash > LATHER) + Ger it, ITE1: used, when heated, to remove color from glass] a very soft, black,… …   English World dictionary

  • Pyrolusite — Infobox mineral name = Pyrolusite category = boxwidth = boxbgcolor = imagesize = caption = Pyrolusite Mineral with Dendrite (height of sample 9 cm) formula = manganese dioxide, MnO2 molweight = color = Darkish, black to lighter grey, somethimes… …   Wikipedia

  • pyrolusite — piroliuzitas statusas T sritis chemija apibrėžtis Mineralas. formulė MnO₂ atitikmenys: angl. pyrolusite rus. пиролюзит …   Chemijos terminų aiškinamasis žodynas

  • pyrolusite — noun Etymology: German Pyrolusit, from Greek pyr + lousis washing, from louein to wash more at lye Date: 1828 a soft black or steel gray mineral of metallic luster consisting of manganese dioxide that is the most important ore of manganese …   New Collegiate Dictionary

  • pyrolusite — noun A dark coloured mineral, consisting of manganese dioxide (MnO), that is an important ore of manganese …   Wiktionary

  • pyrolusite — py·ro·lu·site …   English syllables

  • pyrolusite — py•ro•lu•site [[t]ˌpaɪ rəˈlu saɪt, paɪˈrɒl yəˌsaɪt[/t]] n. mir a grayish black mineral, manganese dioxide, MnO2, the principal ore of manganese • Etymology: 1820–30; pyro + Gk loûs(is) washing + ite I …   From formal English to slang

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