These sphalerite crystals on are from the Elmwood Mine in Carthage, Smith County, Tennessee, Ba-F-Pb-Zn District, Tennessee, 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. Sphalerite is a sulfide and it contains the elements Zn and S. This piece consists of a druse quartz covered breccia chert matrix that hosts dozens of complex sphalerites and sphalerite crystal clusters with some minor calcite crystals attached.This is a large heavy piece that measures 8 1/2 x 4 1/8 x 2 1/4 or 216 x 115 x 57 mm.