- a common mineral, manganese dioxide, MnO2, 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.
Origin of pyrolusite
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Examples from the Web for pyrolusite
Heated in an ignition tube yields water in abundance, otherwise it behaves like pyrolusite.The Elements of Blowpipe Analysis
Frederick Hutton Getman
The substitution of potassium chlorate for pyrolusite is recommended when calcium chloride is present in the bittern.
How does pyrolusite effect the decolorizing of glass containing iron?An Elementary Study of Chemistry
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.
- 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
C19: from pyro- + Greek lousis a washing + -ite 1, from its use in purifying glass
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
Word Origin and History for pyrolusite
Online Etymology Dictionary, © 2010 Douglas Harper