Pyrolusite definitions

pī'rō-lo͝o'sīt
A soft, black to dark gray mineral, MnO2 , the commonest and most important secondary ore of manganese.
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A very soft, black, tetragonal mineral, MnO2, an ore of manganese used in making glass, paint, etc.; manganese dioxide.
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(mineralogy) A dark coloured mineral, consisting of manganese dioxide (MnO2), that is an important ore of manganese.
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Origin of pyrolusite

German Pyrolusit Greek puro- pyro- Greek lousis a washing (from louein to wash leu(ə)- in Indo-European roots)