psilomelane

[sahy-lom-uh-leyn]
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.

Origin of psilomelane

1825–35; < Greek psīló(s) bare, smooth + mélan, neuter of mélas black
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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

Word Origin for psilomelane

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