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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
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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Word History and Origins

Origin of pyrolusite1

1820–30; pyro- + Greek loûs ( is ) washing + -ite 1
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Word History and Origins

Origin of pyrolusite1

C19: from pyro- + Greek lousis a washing + -ite 1, from its use in purifying glass
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Example Sentences

The same pyrolusite (binoxide of manganese) cylinder used with the same thin rod of zinc will precipitate 75 per cent.

Manganese occurs mainly as black oxide (MnO2) in the mineral pyrolusite; and, in a less pure form, in psilomelane and wad.

How does pyrolusite effect the decolorizing of glass containing iron?

As an ore of manganese it is much less abundant than pyrolusite or psilomelane.

Its dioxide (pyrolusite) has been known from very early times, and was at first mistaken for a magnetic oxide of iron.

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