frankliniteMin.|ˈfræŋklɪnaɪt| [f.Franklin, New Jersey, where it is found + -ite.] A compound of oxides of iron, manganese, and zinc, found in brilliant black crystals. 1820Amer.Jrnl.Sc. II. 323 The black zinciferous mineral, the Franklinite.1862Dana Man.Geol. 84 Franklinite, an iron-zinc ore.