Pyrite
Chemical Composition: FeS2 Group: - System: Isometric Family: Sulfides Hardness: 6 - 6.5	Striated, cubic, octahedral or pyritohedral crystals Very heavy, very fragile, with poor cleavage Insoluble in hydrochloric acid, but powder dissolves in nitric acid Gives off spark if struck with hammer Burns at a moderate temperature and fuses easily Found in: Italy, Norway, Spain, Sweden, USA