Definitions for "Pyrolusite"
Keywords:  manganese, mno, dioxide, luster, tints
Manganese dioxide, a mineral of an iron-black or dark steel-gray color and metallic luster, usually soft. Pyrolusite parts with its oxygen at a red heat, and is extensively used in discharging the brown and green tints of glass (whence its name).
a mineral consisting of manganese dioxide; an important source of manganese
The most common ore of manganese composed of manganese dioxide. It is a soft, iron-black to dark-steel-gray colored mineral and is used extensively in creating brown and green tints of glass.