ˌmaŋgəˈnōˌsīt, manˈganəˌ- noun
( -s )
Etymology: German manganosit, from mangan- + connective -s- + -it -ite
: a mineral MnO consisting of manganous oxide occurring in small emerald green octahedrons that turn black on exposure (hardness 5-6, specific gravity 5.18)