Chalcopyrite is seen as the dark area towards the right bottom third on Frank Imbriaccco's prehnite specimen, Mindat photo 183955. ⓘ Union Building and Construction Quarry (UBC Quarry; Tilcon Quarry) Bradley D. Plotkin collection: Somerset Co. Bernards Township ⓘ Millington Quarry (Morris County Crushed Stone Co. Quarry; Tilcon Quarry)