A black or dark gray mineral with a metallic luster, consisting of manganese dioxide.
- Scheele produced chlorine by treating the mineral pyrolusite with hydrochloric acid (HCl).
- The ore, a mixture of ‘psilomelane’ and pyrolusite with much manganiferous limonite, contains masses of cerussite.
- It never occurs as a free element, but only in ores such as pyrolusite, manganite, psilomelane, and rhodochrosite.
Early 19th century: from pyro- 'fire, heat' + Greek lousis 'washing' (because of the mineral's use in decolorizing glass).
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