psilomelane

noun
psi·​lo·​mel·​ane | \ˌsīlōˈmeˌlān\
plural -s

Definition of psilomelane 

: a basic oxide of barium and bivalent and quadrivalent manganese probably BaMnMn8O16(OH)4 — compare hollandite, coronadite

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History and Etymology for psilomelane

psil- + -melane

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