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psilomelane

[sahy-lom-uh-leyn] /saɪˈlɒm əˌleɪn/
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
1825-1835
1825-35; < Greek psīló(s) bare, smooth + mélan, neuter of mélas black
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British Dictionary definitions for psilomelane

psilomelane

/sɪˈlɒmɪˌleɪn/
noun
1.
a common black to grey secondary mineral consisting of hydrated basic oxide of manganese and barium: a source of manganese. Formula: BaMn9O16(OH)4 Also called romanicite
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
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