This ferberite with pyrites specimen 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 ferberite and pyrite. Ferberite is an oxide that contains the elements Fe, W and O. Pyrite is a sulfide containing the elements Fe and S. This specimen consists of terminated blade-like ferberite crystal that hosts modified cubic pyrite crystals and clusters. There are minor deposits of quartz on the rear surface. This piece is a small miniature that measures 1 1/8 x 13/16 x 3/4 inches or 28 x 20 x 19 mm.