Pyrite also known as iron pyrite is a chemical compound of iron and sulphide. It's one of the most common sulphide minerals. This group is made up of inorganic compounds that contain sulphur and one more chemical element.
Pyrite contains a high percentage of iron and is relatively common. It can be found in many geological environments.
This rough piece of pyrite sparkles incessantly as it reflects light from every angle. Sadly capturing sparkle in a photograph is not easy. The reason it sparkles is because light is reflecting off minute crystals.
Pyrite should never be allowed to get wet and should not be stored anywhere humid.