Definition of pyrolusite in English:

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pyrolusite

Pronunciation: /ˌpʌɪrə(ʊ)ˈluːsʌɪt/

noun

[mass noun]
A black or dark grey mineral with a metallic lustre, consisting of manganese dioxide.
Example sentences
  • 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.

Origin

Early 19th century: from pyro- 'fire, heat' + Greek lousis 'washing' (because of the mineral's use in decolorizing glass).

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