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

The binoxide, or peroxide, is the black manganese of commerce, and the pyrolusite of mineralogists, and is by far the most abundant of the manganese ores.

From Scientific American Supplement, No. 401, September 8, 1883 by Various

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

From The Elements of Blowpipe Analysis by Getman, Frederick Hutton

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

From Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria" by Various

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 McPherson, William

A sample of pyrolusite weighing 0.6000 gram is treated with 0.9000 gram of oxalic acid.

From An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes by Talbot, Henry P.