What is iron pyrites (iron disulfide, FeS2) commonly called, because it resembles a precious metal?
Iron the production of ferrites, useful magnetic storage media in computers, and pigments. The best known sulfide is iron pyrite (FeS), also known as fool's gold owing to its golden luster. It is not an iron(IV) compound, but is actually an iron(II) polysulfide containing Fe and ions in a distorted sodium chloride structure. The binary ferrous and ferric halides are well-known, with the exception of ferric iodide. The ferrous halides typically arise from treating iron metal with the corresponding hydrohalic acid to give the corresponding hydrated salts. Iron reacts with fluorine, chlorine, and bromine to give the corresponding ferric halides, ferric
Iron cobra fourth edition "Monster Manual" (2008), under the homunculus entry. The iron cobra resembles a normal cobra, only made of metal. The metal is usually, as the creature's name suggests, iron. The body is an interconnection of metal segments, while the fan is wing-like, and inscribed with runes. It has sharp fangs, and rubies for eyes. The iron cobra is typically built and animated (they require more magic than machinery) by neutral or evil aligned mages in the above-mentioned settings to act as a sentry, interrogator, assassin, or servant. They are often placed in a dungeon or a laboratory or such