The mineral Pyrite, or iron pyrite, is an iron sulfide with the formula FeS2. Pyrite is the most common of the sulfide minerals. This mineral’s metallic luster and pale-to-normal, brass-yellow hue have earned it the nickname Fool’s Gold because of its resemblance to gold. The color has also led to the nicknames brass, brazzle and Brazil, primarily used to refer to pyrite found in coal.  Pyrite is usually found associated with other sulfides or oxides in quartz veins, sedimentary rock, and metamorphic rock, as well as in coal beds.