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Pyrolusite 1

Definition: 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).

pyrolusite 2

Definition: a mineral consisting of manganese dioxide; an important source of manganese

 

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