Lustrous, dark gray, flattened chalcocite crystals to 6 mm richly cover the matrix of solid chalcocite on this fine specimen from the famous Geevor Mine of Cornwall. According to the label, the piece was collected in 1979 from the North Pig Lode of this noted mine. The area around this historic mine was intermittently active from the late 1700s until 1990. Ex. Wes Parker Collection.