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psilomelane

[sahy-lom-uh-leyn]
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noun
  1. a common mineral consisting of a mixture of pyrolusite and other oxides of manganese, usually found in black, rounded masses: an ore of manganese.
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Origin of psilomelane

1825–35; < Greek psīló(s) bare, smooth + mélan, neuter of mélas black
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for psilomelane

Historical Examples

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

    A Textbook of Assaying: For the Use of Those Connected with Mines.

    Cornelius Beringer and John Jacob Beringer

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


British Dictionary definitions for psilomelane

psilomelane

noun
  1. a common black to grey secondary mineral consisting of hydrated basic oxide of manganese and barium: a source of manganese. Formula: BaMn 9 O 16 (OH) 4Also called: romanicite
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Word Origin

C19: from Greek psilos bare + melas black
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