The correct answer is A. Pyrite is a sulphide of iron. It is a mineral with the chemical formula FeS2. It is also known as fool’s gold because it can be mistaken for gold due to its golden color. Pyrite is a common mineral and is found in many parts of the world. It is used in a variety of industries, including mining, metallurgy, and chemistry.
Option B is incorrect because pyrite is not a sulphide of copper. Copper sulphide is a mineral with the chemical formula CuS. It is also known as chalcopyrite.
Option C is incorrect because pyrite is not both a sulphide of iron and a sulphide of copper. Pyrite is a sulphide of iron only.
Option D is incorrect because pyrite is a real mineral. It is not a fictional mineral.