psilomelane

psilomelane

[sahy-lom-uh-leyn]
noun
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:
1825–35; < Greek psīló(s) bare, smooth + mélan, neuter of mélas black

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psilomelane (sɪˈlɒmɪˌleɪn)
 
n
Also called: romanicite a common black to grey secondary mineral consisting of hydrated basic oxide of manganese and barium: a source of manganese. Formula: BaMn9O16(OH)4
 
[C19: from Greek psilos bare + melas black]

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