py·ro·lu·site (p  r -l  st)n. A soft, black to dark gray mineral, MnO2, the commonest and most important secondary ore of manganese. [German Pyrolusit : Greek puro-, pyro- + Greek lousis, a washing (from louein, to wash; see leu(  )- in Indo-European roots).] |
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| Noun | 1. | pyrolusite - a mineral consisting of manganese dioxide; an important source of manganese atomic number 25, manganese, Mn - a hard brittle grey polyvalent metallic element that resembles iron but is not magnetic; used in making steel; occurs in many minerals mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition |
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