cred·​ner·​ite | \ˈkrednəˌrīt\
plural -s

Definition of crednerite 

: a grayish to black foliated mineral CuMn2O4 consisting of copper, manganese, and oxygen

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First Known Use of crednerite

1849, in the meaning defined above

History and Etymology for crednerite

German crednerit, from K. F. Heinrich Credner †1876 German geologist + German -it -ite

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The first known use of crednerite was in 1849

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to make faulty or ineffective

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