pyrolusite

American  

[pahy-ruh-loo-sahyt, pahy-rol-yuh-sahyt] / ˌpaɪ rəˈlu saɪt, paɪˈrɒl yəˌsaɪt /

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.

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pyrolusite British  

/ 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

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Etymology

Origin of pyrolusite

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

Example Sentences

Generally resembles pyrolusite, but is distinguished from it by its superior hardness.

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