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psilomelane
noun
psi·lo·mel·ane
\ˌsīlōˈmeˌlān\
Definition of psilomelane
-s
: a basic oxide of barium and bivalent and quadrivalent manganese probably BaMnMn8O16(OH)4 — compare hollandite coronadite
From the M-W Editors
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Origin and Etymology of psilomelane
psil- + -melane
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