Corundum with Spinel, Willemite, Pyrrhotite and Norbergite

Franklin, Franklin Mining District, Sussex County, New Jersey  USA

Specimen size: 10.1 × 7 × 6 cm = 3.98” × 2.76” × 2.36”
Main crystal size: 0.7 × 0.5 cm = 0.28” × 0.20”