Siderosis is the deposition of iron

Iron

Iron is a chemical element with the symbol Fe and atomic number 26. It is a metal in the first transition series. It is the most common element forming the planet Earth as a whole, forming much of Earth's outer and inner core. It is the fourth most common element in the Earth's crust...

 in tissue.

When used without qualification, it usually refers to an environmental disease of the lung

Lung

The lung is the essential respiration organ in many air-breathing animals, including most tetrapods, a few fish and a few snails. In mammals and the more complex life forms, the two lungs are located near the backbone on either side of the heart...

.

Also Siderosis Bulbi, deposition of iron into the eye causing injury as the material chemically reacts with tissues and cells.

Causative agent

Iron oxide present in welding material, foundries, iron ore mining. It can also be caused by powdered hematite

Hematite

Hematite, also spelled as haematite, is the mineral form of iron oxide , one of several iron oxides. Hematite crystallizes in the rhombohedral system, and it has the same crystal structure as ilmenite and corundum...

, sometimes used by Egyptians to protect tombs.