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The mineral pyrite, or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula FeS2. This mineral's metallic luster and pale brass-yellow hue give it a superficial resemblance to gold, hence the well-known nickname of fool's gold. The color has also led to the nicknames brass, brazzle, and Brazil, primarily used to refer to pyrite found in coal. Pyrite is the most common of the sulfide minerals. The name pyrite is derived from the Greek ÏÏÏÎ¯ÏÎ·Ï (pyritÄs), of fire or in fire, in turn from ÏÏÏ (pyr), fire.
It is not iron(IV) sulfide; the iron is in a +2 oxidation state, combined with an S 2 2- ion (the sulfur analog of the peroxide ion). Pyrite burns when heated to form sulfur dioxide and iron(III) oxide: The reaction is sometimes used in industry as a source of sulfur dioxide for the manufacture of sulfuric acid.he same pigment can be obtained from the reaction of iron(II) with ferricyanide: The product of the reaction is the blue color ingredient in many artist's pigments, printing inks, and dyes (including Berlin blue, Chinese blue, mineral blue, Paris blue, and Prussian blue).