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Butlerite

noun
But·​ler·​ite | \ˈbətləˌrīt\
plural -s

Definition of Butlerite 

: a mineral Fe(SO4)(OH).2H2O consisting of hydrous basic sulfate of iron

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History and Etymology for Butlerite

Dean G.M. Butler, born 1881 American geologist and mineralogist + English -ite

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