ˈil(t)səməˌnīt, ˈilzə- noun
( -s )
Etymology: German ilsemannit, from J. C. Ilsemann died 1822 German mining commissioner + German -it -ite
: a mineral Mo 3 O 8 . n H 2 O(?) consisting of black, blue-black, or blue earthy massive hydrous oxide or perhaps sulfate of molybdenum