Willemite, Franklinite and Zincite- The Trio of Classic Ore Minerals from the Franklin Mine

Willemite, franklinite and zincite represent the three most important zinc-bearing minerals mined at the Franklin Mine, Franklin, New Jersey. Franklinite is a black-colored zinc iron oxide mineral that is never fluorescent. Zincite is a zinc oxide that sometimes shows a yellow fluorescent response under long wave UV, but often is not fluorescent. Willemite, a zinc silicate, is one of the brightest fluorescing minerals from the Franklin Mine, showing a bright green response under short wave UV, sometimes with long-lasting