pyrolusite

noun

py·​ro·​lu·​site ˌpī-rō-ˈlü-ˌsīt 

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

Word History

Etymology

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

First Known Use

1828, in the meaning defined above

Kids Definition

pyrolusite

noun

py·​ro·​lu·​site ˌpī-rō-ˈlü-ˌsīt 

: a mineral consisting of manganese dioxide that is of an iron-black or dark steel-gray color and metallic luster, is usually soft, and is the most important ore of manganese