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

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

From An Elementary Study of Chemistry by McPherson, William

How does pyrolusite effect the decolorizing of glass containing iron?

From An Elementary Study of Chemistry by McPherson, William

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

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.

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

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