When it comes to Covellite, Butte, Montana, gets most of the attention when it comes to specimens from the USA. Most people don't realize that perhaps the largest and finest Covellites were actually found in Summitville, Colorado. The Colorado School of Mines has a Covellite specimen on display with individual crystals that measure approximately 5-6 inches across. This specimen is a good reference piece of Covellite featuring classic, bladed crystals measuring up to 3.0 cm, which is very good sized from this locality. The blades have the distinctive iridescent blue-purple hue for the species. Ex. Brian Kosnar Collection.