pyrolusite - meaning and definition. What is pyrolusite
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What (who) is pyrolusite - definition

MANGANESE DIOXIDE MINERAL
Polianite; Pyrolucite
  • A microscopic image of Pyrolusite

Pyrolusite         
·noun 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).
Polianite         
·noun Manganese dioxide, occurring in tetragonal crystals nearly as hard as quartz.

Wikipedia

Pyrolusite

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.