This combination of arsenopyrite and quartz comes from the Yaogangxian mines, Hunan Province, China. Yaogangxian produces fine silvery arsenopyrite crystals to perhaps 7 cm, but this unusual example shows a bright blue iridescent surface on the arsenopyrite crystals. Specimen 3.2 cm tall with arsenopyrite crystals 1.6 cm across. Marcus J. Origlieri specimen and photograph.