psilomelane

noun

psi·​lo·​mel·​ane

ˌsīlōˈmeˌlān

plural -s

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

Word History

Etymology

psil- + -melane

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