This is a large plate of densely intergrown, botryoidal, translucent, smithsonite, which exhibits a high quality satiny luster, along with superb blue coloration. It is CLASSIC! The spheres reach 1.5 cm across. It is from the Kelly mine that botryoidal smithsonite reaches its zenith and this color is the primo "Kelly blue" hue. Only very minor contact damage on the periphery keeps this specimen from being perfect. It certainly displays very dramatically and you would be hard pressed to normally be able to find such a large and solid piece of Kelly blue of this quality, overall. The smithsonite averages 1.5 cm thick, by the way, on top of limonite matrix. This is carving grade, and could be vcut for cabochons and jewelry.