Atacamite with Chrysocolla pseudomorphs after Atacamite (rare)

Item Description

A lovely Atacamite specimen from the famed La Farola Mine (the type locality for Atacamite) featuring fantastic, highly lustrous, deep emerald green crystal "sprays", with individual crystals measuring to about 3 mm, which have also been pseudomorphed by beautiful blue to greenish-blue colored Chrysocolla, creating a very attractive effect. I can't remember seen another example of this material off the top of my head, though I'm sure others exist, but make no mistake that this is a rarely seen phenomenon from this mine, and would make a great addition to any collection of pseudomorphs, secondary copper minerals, or specimens from the Atacama Desert. From the collection of William ("Bill") (1927-2006) and Anne (1928-2021) Cook of Cleveland, Ohio (#13404). This husband and wife duo were actively involved in the mineral world for many decades. Bill was a PhD geologist, and Anne was a mathematician, and they both were very serious mineral collectors. Bill served for many years as adjunct curator of mineralogy at the Cleveland Museum of Natural History, and Anne was inducted into the Micromounters' Hall of Fame on October 12, 2019. Both Bill and Anne, at various times, served as president both of the Mineralogical Society of Cleveland and of the Micromineral Society of the Cleveland Museum of Natural History, and Anne was inducted into the mi The rare barium lithium beryllium phosphate Wilancookite was named in their honor in 2015.