lepidomelane

noun
lep·​i·​do·​mel·​ane | \ˌlepədōˈmeˌlān\
plural -s

Definition of lepidomelane 

: a mineral K2(Fe, Mg)4–6(Si, Al, Fe)8O20(OH)4 consisting of a mica that is a biotite containing ferric iron

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History and Etymology for lepidomelane

German lepidomelan, from lepid- + -melane

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