pyrolusite

noun py·ro·lu·site \ˌpī-rō-ˈlü-ˌsīt\

Definition of PYROLUSITE

: a soft black or steel-gray mineral of metallic luster consisting of manganese dioxide that is the most important ore of manganese

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German Pyrolusit, from Greek pyr- + lousis washing, from louein to wash — more at lye

First Known Use: 1828

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