These sphalerite with calcite crystals are from the Elmwood Mine in Carthage, Smith County, Tennessee, Ba-F-Pb-Zn District, US. This mine contains three shafts called the Elmwood, Cumberland, and Gordonsville. It has an entry slope called the Stonewall. They contain eleven different minerals including sphalerite which is the main ore mineral. This piece consists of complex sphalerite crystal plate that host several crystals and small clusters of calcite. Calcite is a common gangue mineral within the mine. This piece is a small cabinet sized specimen that measures 2 1/4 x 1 9/16 x 1 3/8 inches or 57 x 39 x 35 mm.