Goethite is rich in iron and is usually formed when other iron-rich minerals such as pyrite combine with oxygen and break down through weathering. Goethite is often associated with minerals such as calcite and quartz, which together form a hard crust on the weathered minerals. Goethite of sedimentary origin is found in lakes and springs. Goethite in hydrothermal deposits is formed at low temperature and is symbiotic with quartz, siderite, etc.
During regional metamorphism, iron hydrates were dehydrated to goethite.
- Its main modern use is as an iron ore
- Goethite is an important component of ochre pigments
- Fine goethite specimens are rare and therefore are valued collectibles
- Elimination of cadmium which is the chemical element from the contaminated waters in industrial liquid wastes


