FeAsS

This sample of arsenopyrite is displayed in the Smithsonian Museum of Natural History. Arsenopyrite is a sulfide mineral of arsenic and iron with the composition FeAsS . This large sample is about 22x18 cm and is from Panasqueira, Portugal.

This sample of arsenopyrite is about 8x10 cm and is from Trepca mine, Srbija, Yugoslavia. It is formed with pyrite and sphalerite.

This large arsenopyrite crystal formation is about 13x30 cm and is from Obira mine, Oita, Japan.

This arsenopyrite sample is about 7x6 cm and is from Obira mine, Oita, Japan. It is formed with fluorite and quartz.