This arsenopyrite 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 arsenopyrite. It is a sulfide that contains the elements Fe, As and S. This specimen consists of a is a vug-like formation of large, complex, arsenopyrite crystals with druse quartz. The crystals have a bright brassy color and metallic luster. There are natural contact areas around the perimeter that do not detract from the piece.. This piece measures 2 3/4 x 2 1/2 x 1 1/2 inches or 70 x 64 x 38 mm.