Dark gray chalcocite crystals make up this excellent thumbnail cluster from a historic United States locality. The specimen is from Bristol Copper Mine, Bristol, Hartford County, Connecticut, USA. The piece measures 2.8 cm wide by 2.8 cm tall and 1.4 cm front to back. The crystals have a good luster for a chalcocite. The specimen comes with a slide of the specimen taken by famous mineral photographer Jeff Scovil. Ex Marilyn Dodge collection.