Iron Sulphide Chemical Formula: Understanding Its Properties And Uses

Iron(II) sulfide, Brown to black powder, 99.9 (Metals basis), Alfa


Iron sulphide, also known as pyrite, is a mineral that contains iron and sulphur. Its chemical formula is FeS2, which means it is made up of one iron atom and two sulphur atoms. This mineral is commonly found in sedimentary rocks and can be used for various purposes.

Properties of Iron Sulphide

Iron sulphide has a metallic luster and a pale brass-yellow color. It has a hardness of 6 to 6.5 on the Mohs scale and a specific gravity of 4.9 to 5.2. Iron sulphide is not soluble in water and is non-toxic. It is also a good conductor of electricity and heat.

Uses of Iron Sulphide

Iron sulphide has several uses. It is used in the production of sulphuric acid, which is a key component in fertilizer production. It is also used in the manufacturing of batteries, as it can store energy efficiently. Additionally, iron sulphide is used as a semiconductor in electronics and as a catalyst in chemical reactions.

Environmental Impact of Iron Sulphide

Iron sulphide can have negative environmental impacts. When exposed to air and water, it can oxidize and produce acid mine drainage, which can harm aquatic life and water quality. Additionally, iron sulphide can release harmful gases when heated or burned, which can contribute to air pollution.

Precautions When Handling Iron Sulphide

When handling iron sulphide, it is important to take precautions to prevent exposure. Iron sulphide dust can be harmful if inhaled, so it is recommended to wear a dust mask. Additionally, iron sulphide can be flammable and should be stored in a cool, dry place away from heat sources.

How to Identify Iron Sulphide

Iron sulphide can be identified by its metallic luster and pale brass-yellow color. It can also be identified by its hardness and specific gravity. Iron sulphide can be distinguished from gold by its lighter color and from copper by its lack of malleability.


Iron sulphide, with its chemical formula FeS2, is a mineral that has several uses in various industries. However, it can also have negative environmental impacts if not handled properly. By taking precautions and identifying iron sulphide correctly, we can use it in a safe and effective manner.