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hercynite

noun
her·​cy·​nite | \ˈhərsᵊnˌīt\
plural -s

Definition of hercynite 

: a black mineral FeAl2O4 consisting of an oxide of iron and aluminum and constituting a member of the spinel series

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History and Etymology for hercynite

German hercynit, from Latin Hercynia (silva), its locality + German -it -ite

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