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**Chemical name:** Ferric iron oxide **Chemical formula:** Fe₃O₄ **Molar mass:** 231.5 g/mol **Mohs scale hardness:** 6 **Crystal system:** Cubic **Unit cell:** Cubic face-centered arrangement of oxygen ions, with iron cations occupying the interstitial sites. **Crystal habit:** Octahedral **Description:** Magnetite is the oldest known material with magnetic properties. In nature, it typically forms black, shiny metallic crystals and is often found as a fine-grained, granular mineral with an inverse spinel structure. **Applications:** Magnetite is considered the highest quality form of iron ore.
