Tags: Chemical Substance, Mineral.
Pyrolusite is a mineral consisting essentially of manganese dioxide (MnO2) and is important as an ore of manganese. It is a black amorphous appearing mineral often with a granular fibrous or columnar structure sometimes forming reniform crusts. It has a metallic luster a black or bluish-black streak and readily soils the fingers. The specific gravity is about 4.8. Its name is from the Greek for fire and to wash in reference to its use as a way to remove tints from glass.
