ilsemannite

noun
il·se·mann·ite | \ˈil(t)səməˌnīt, ˈilzə-\
plural -s

Definition of ilsemannite 

: a mineral Mo3O8·nH2O(?) consisting of black, blue-black, or blue earthy massive hydrous oxide or perhaps sulfate of molybdenum

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History and Etymology for ilsemannite

German ilsemannit, from J. C. Ilsemann †1822 German mining commissioner + German -it -ite

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