Franklin Furnace is a famous mineral location for rare zinc, iron, manganese minerals in old mines in Franklin, New Jersey USA. This locale produced more species of minerals (over 300) and more different fluorescent minerals than any other location. The famous mineral association (assemblage) from Franklin includes willemite, zincite and franklinite.

Other rare minerals include esperite, clinohedrite, hardystonite, and others. There are scores of minerals found only here, such as Johnbaumite (an arsenous apatite), McGovernite, etc.

Sterling Hill is a few miles away and was part of the same ore body.