Ferrous ions are positively charged ions of iron, specifically represented as Fe^2+. They are formed when iron loses two electrons and are commonly found in various compounds, including minerals and biological systems. Ferrous ions play a crucial role in processes such as oxygen transport in blood, where they are part of the hemoglobin molecule. In nature, ferrous ions can be found in both soluble and insoluble forms. They are important in industrial applications, such as in the production of steel and other alloys. Additionally, ferrous ions can participate in redox reactions, making them significant in environmental chemistry and biogeochemical cycles.