Smithsonite | blue crystal, rare mineral specimen from Kelly Mine, USASmithsonite from the famed Kelly Mine in New Mexico is especially prized for its striking blue coloration, silky luster, and smooth botryoidal formations. Formed through the oxidation of zinc rich lead deposits within the Magdalena mining district, Kelly Mine smithsonite developed in cavities and fractures of the surrounding limestone host rock, producing some of the worlds most recognizable blue smithsonite specimens. The vivid turquoise to sky blue