mallardite

noun
mal·lard·ite | \ ˈmalə(r)ˌdīt \
plural -s

Definition of mallardite 

: hydrous sulfate of manganese MnSO4.7H2O

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History and Etymology for mallardite

French, from Ernest Mallard †1894 French mineralogist + French -ite

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occurring twice a year or every two years

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