A LARGE, SOLID, OLD-TIME and SHOWY specimen of the RARE sulfate, krohnkite, from the Type Locality, the Chuquicatmata Mine of Chile. Without question, this specimen exhibits the most intense teal blue color I have ever seen in a natural mineral specimen and has great translucence! And the variation in blue color, in itself, is very noteworthy. The piece exhibits what is classic for the species, lamellar growth of crystals in parallel bundles. Ex. George Elling Collection.