Willemite-Calcite + Franklinite
Is an important zinc ore ,mainly found at Franklin, New Jersey. A zinc oxide with formula: Zn2SiO4 and hardness of 5.5. In this case is associated with calcite ( red) and Franklinite ( black)
Is highly fluorescent in green at short wave U.V. light
A real must for a collector who want something special.
Weight: 4.32 ct.