Stability: stable, soluble in hydrochloric acid, sulfuric acid is generated +3 price of iron salt. Solubility: insoluble in water, not reacting with water. Oxidizing: (high temperature) are CO, H2, Al, C, Si, etc. restoration. Form of existence: Mineral: Hematite, ocher Synonyms: ferric oxide, iron oxide red, iron-Dan, hematite, rust