This specimen is from a brand new find for the species in the Machacamarca mining district in Bolivia. It is not from the typical locality at the Unificada mine in Potosi. It features dozens of exceptionally rare, translucent, green color (partially iron-coated), euhedral crystals with butterfly-twins measuring up to 15 mm. It is one of the few specimens from a very exciting new find, which hopefully could one day produce specimens of the same size and quality as those from Unificada.