psilomelane

psi·lom·e·lane

[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) [Click for IPA pronunciation guide]
 
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]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Psilomelane is always a great word to know.
So is quincunx. Does it mean:
a fool or simpleton; ninny.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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