pyrolusite

American  

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

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

See Examples For:

pyrolusite

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

From The Elements of Blowpipe Analysis by Frederick Hutton Getman

Appended are two analyses of pyrolusite containing sesquioxide of iron.

From British Manufacturing Industries Pottery, Glass and Silicates, Furniture and Woodwork. by L. Arnoux

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

From The Elements of Blowpipe Analysis by Frederick Hutton Getman

How does pyrolusite effect the decolorizing of glass containing iron?

From An Elementary Study of Chemistry by William McPherson

While studying the action of hydrochloric acid upon the mineral pyrolusite, in 1774, Scheele obtained a yellowish, gaseous substance to which he gave a name in keeping with the phlogiston theory then current.

From An Elementary Study of Chemistry by William McPherson