Franklinite is named after the locality of Franklin, New Jersey, where it is found. To date, this mineral is found only at Franklin and neighboring Ogdensburg, New Jersey. There are no other localities for Franklinite, but at these two localities it is quite abundant. Large crystals of previous mining eras are no longer found, and are considered classics that are highly sought-after by collectors.
Franklinite is usually associated with brilliantly
fluorescent Calcite and
Willemite, and may also occur with orange
Zincite, providing specimens of nice color contrasting.
Franklinite is sometimes classified as a variety of the mineral
Magnetite, but it is in fact a distinct mineral species.