Chemical formula of pyrite reclaiment is

The mineral pyrite or iron pyrite also known as fool's gold, is an iron sulphide with the chemical formula FeS₂. Pyrite is the most abundant sulphide mineral.
Its metallic luster and pale brass hue give it a superficial resemblance to gold, thus also known as fool’s gold.
It is usually found associated with other sulphide or oxides in quartz veins, sedimentary rock and metamorphic rock, as well as in coal beds.