The most geologically unique location on the planet, Franklin/Ogdensburg, NJ,
is also home of the unique phenomenon...Fluorescent Minerals.
A small percentage of inorganic minerals aided by metal impurities have the ability to absorb ultra-violet energy. This energy moves the electrons with a materials atoms. The orbital position of the atom is constantly shifting and returning to normal giving off absorbed energy as visible colour. Interesting enough, this material fluoresces naturally in outer space.
From the 1910's there were two Zinc Mines in adjoining towns,
Franklin and Ogdensburg, NJ.
Franklin had the most concentrated amounts of zinc,