SC463 - Calcite
Locality: Franklin Mine, Franklin, Franklin Mining District, Sussex County, New Jersey, USA (MINDAT)
Size: 11 x 9 x 7.5 cm - Large cabinet (10-15 cm)
Weight: >500 g
minID: YFX-Q53
Just calcite, with a little franklinite (and a very little zincite). Fluorescent red under shortwave UV light.
