Meaning of pyrolusite

py•ro•lu•site

Pronunciation: (pī"ru-l'sīt, pī-rol'yu-sīt"), [key]
— n.
  1. a common mineral, manganese dioxide, MnO, the principal ore of manganese, used in various manufactures, as a decolorizer of brown or green tints in glass, and as a depolarizer in dry-cell batteries.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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