This is a superb, old-time specimen of rich, yellow Cadmian Smithsonite pseudomorphing saddle-shaped Dolomite crystals from the historic Monte Cristo zinc mine at Rush, Arkansas. The Monte Cristo was operated sporadically in the late 1800s and early 1900s. The vibrant, lemon yellow Cadmian Smithsonite on this handsome cabinet piece is replacing the Dolomite and also formed distinct, but tiny, 1 mm, bright yellow Cadmian Smithsonite crystals on the pseudomorphs themselves. This is one of the most rare of USA smithsonites, and this is both big and beautiful - at the top of the game for what has survived the years. The partial and complete pseudomorphs of Smithsonite after Dolomite can be seen along the edges of the piece and the matrix consists of granular massive, pleasingly pink Dolomite. The majority of the display surface is in excellent condition and a very minimal amount of damage on the bottom edge does not detract from this very fine and showy piece. From the collection of Henry de Linde (March 21, 1923 – April 4, 2019) of Hot Springs, Arkansas. Henry was one of the most prominent figures in the history of Arkansas mining and mineral collecting. Along with being a miner, mineral collector and an amateur mineralogist, de Linde was one of the founders of the Coon Creek Association mineral club. He was the owner of several key localities in Arkansas including the Diamond Jo Quarry (on the south rim of Magnet Cove), the type locality for Delindeite, which was named in his honor in 1987. He collected this specimen circa 1965 per his label.