A brownish-black ore of manganese consisting chiefly of manganese dioxide, MnO2; = pyrolusite, n.
| 单词 | θ6748 |
| 释义 | the world > the earth > minerals > types of mineral > oxides and hydroxides > [noun] > rutile and uranite groups A02 > manganese dioxide (10) brownstone1657 A brownish-black ore of manganese consisting chiefly of manganese dioxide, MnO2; = pyrolusite, n. manganese1662 A black mineral substance used from ancient times in glass-making and as a component in coloured ceramic glazes, and now in many industrial… magnesia1677 = manganese, n. 1a. Also black magnesia. Obsolete. soap of glass1815 see quots. pyrolusite1828 A common manganese ore consisting of manganese dioxide, which occurs as black or dark grey crystals with a metallic lustre and is formed chiefly… varvicite1829 ‘An impure pyrolusite or wad, resulting from the alteration of manganite’ (Chester). polianite1849 A mineral containing manganese, formerly regarded as a variety of pyrolusite but now generally regarded as identical with it. manganese dioxide1866 manganese(iv) oxide, a grey-black solid, MnO2, which occurs naturally as pyrolusite and is used as a catalyst, oxidizing agent, depolarizer in… pelagite1876 A mixture of manganese oxide and other metal oxides forming crusts and nodular concretions on the seabed. Also: a manganese nodule or similar… manganese oxide1882 each of the six oxides of manganese; esp. = manganese dioxide n. |
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