The simple cubic form of this Boleite is deceptive compared to its complex chemistry! Boleite is a very rare, and much desired, complex potassium-lead-silver-copper hydroxy-chloride and this is great specimen with a single, 7 mm, dark blue cube with modified corners nicely isolated on a piece of light olive green clay matrix. This piece originates from the finds by Ed Swoboda in the 1970s. Ex. Robert Reynolds collection. Pictured: Rock ’N Gem magazine, Jan-Feb 2025 “The Other Copper Minerals: 12 Lesser-known collectable species.”