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**Chemical name:** Ferric iron oxide
**Formula:** Fe₃O₄
**Molar mass:** 231,5 g/mol
**Hardness:** 6
**Crystal system:** Cubic system
**Cell:** Cubic face-centred arrangement of oxygen ions, the iron cations are located in the cavities.
**Crystal habit:** Octahedral.
**Information:** Magnetite is the oldest known substance having magnetic properties. In nature it forms black shiny metallic crystals. In most cases it is found as a fine crystalline granular mineral with inverse spinel structure.
**Use:** Magnetite is the best quality of iron.