The mineral Iron Pyrite is also known as fool's gold is an iron sulphide with chemical formula FeS2 . It is the most abundant pyrite found on earth's crust .
Pyrite's metallic lustre and pale brass yellow colour give it a superficial resemblance to gold , to the untrained naked eye . Unlike gold ,it is brittle and can be easily broken .
Iron pyrite is unstable at earth's surface . It is present in the dust from the coal mining operations . Pyrite oxidation is sufficiently exothermic . Because of this , underground coal mines have serious problem of spontaneous combustion .
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