An interesting continental divide kept one side of this large, lustrous 'ruby jack" Sphalerite clear of the scattering of smaller crystals of Calcite that surround a larger, gemmy scalenohedral Calcite termination on the other side of the divide. Excellent presentation horizontally on its own or vertically in a stand. Elmwood Mine, Carthage, Smith County, Tennessee, USA. 4.5" x 3.75" x 1.6", 1.16 lbs