pyrolusite

[pahy-ruh-loo-sahyt, pahy-rol-yuh-sahyt]

noun

1. a common mineral, manganese dioxide, MnO 2 , the principal ore of manganese, used in various manufactures, as a decolorizer of brown or green tints in glass, and as a depolarizer in dry-cell batteries.

pyrolusite

/ ˌpaɪrəʊˈluːsaɪt /

noun

1. a blackish fibrous or soft powdery mineral consisting of manganese dioxide in tetragonal crystalline form. It occurs in association with other manganese ores and is an important source of manganese. Formula: MnO 2

Word History and Origins

Origin of pyrolusite¹

1820–30; pyro- + Greek loûs ( is ) washing + -ite ¹

Word History and Origins

Origin of pyrolusite¹

C19: from _pyro- + Greek lousis a washing + _-ite ¹ , from its use in purifying glass

Example Sentences

Heated in an ignition tube yields water in abundance, otherwise it behaves like pyrolusite.

From Project Gutenberg

Manganese is found in nature chiefly as the dioxide MnO2, called pyrolusite.

From Project Gutenberg

The substitution of potassium chlorate for pyrolusite is recommended when calcium chloride is present in the bittern.

From Project Gutenberg

The chlorine generated by the pyrolusite is passed into a solution of potassium iodide.

From Project Gutenberg

Its ores occur abundantly in nature as the minerals pyrolusite, manganite, etc.

From Project Gutenberg