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. It is a carbonite that contains the elements Ca, Mg, C and O. This is a cluster of complex sphalerites with a minor calcite crystal.This piece is a small miniature that measures 1 3/16 x 1 1/8 x 3/4 inches or 30 x 28 x 19 mm.