a very soft, black, tetragonal mineral, MnO, an ore of manganese used in making glass, paint, etc.; manganese dioxide
Origin of pyrolusiteGerman pyrolusit from Classical Greek pyr, fire + lousis, a washing ( from louein, to wash from Indo-European base an unverified form lou-, to wash from source lather) + German -it, -ite: used, when heated, to remove color from glass
A soft, black to dark gray mineral, MnO2, the commonest and most important secondary ore of manganese.
Origin of pyrolusiteGerman Pyrolusit Greek puro- pyro- Greek lousis a washing ( from louein to wash ; see leu(ə)- in Indo-European roots.)