A good refernce specimen from the Caldwell Quarry in Danville, Boyle County, Kentucky. A nice complex sphalerite crystal 3/8 inch across (1 cm) sits on a bed of translucent calcite crystals colored brown by bitumen inclusions, with very minor barite. Overall measures 3.5 x 2.75 x 1.5 inches (9 x 7 x 3.8 cm). No damage. On matrix of re-crystallized limestone.