This bournonite is from the Yaogangxian Mine, Xaogangxian W-Sn Ore Field, Tizhang, Chenzhou Prefecture, Hunan Province of China. Tungsten and tin are the primary minerals extracted from multiple ore bodies in an area spanning 4 x 2.5 km. Seventy-eight different species of minerals are found there Including bornonite. It is a lead sulfide that contains the elements Pb, Cu, Sb and S. This specimen is a complex bournonite crystal with gogwheel-like characteristics (photo 2). It has a silver grey color and a sub-metallic luster. This piece is a small miniature that measures 1 1/16 x 7/8 x 5/8 inches or 26 x 22 x 16 mm.