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klockmannite

noun
klock·mann·ite | \ ˈkläkməˌnīt \
plural -s

Definition of klockmannite 

: a mineral CuSe consisting of a selenide of copper found in tarnished blue-black granular aggregates

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History and Etymology for klockmannite

German klockmannit, from Friedrich Klockmann †1937 German mineralogist + German -it -ite

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