pyrolusite Hear it!

pyrolusite Definition

pyro·lu·site (pī′rō lo̵̅o̅′sīt′, pī räl′yo̵̅o̅-)

noun

a very soft, black, tetragonal mineral, MnO, an ore of manganese used in making glass, paint, etc.; manganese dioxide

Etymology: Ger pyrolusit < Gr pyr, fire + lousis, a washing (< louein, to wash < IE base *lou-, to wash > lather) + Ger -it, -ite: used, when heated, to remove color from glass