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Magnetite (Photo) [abbr. Mag ]

Year of discovery: 1845 (Magnesía, Greece), 1875 (Japan)

Locality list: 2,494 localities of magnetite

• Fe₃O₄
• [Fe²⁺][Fe³⁺₂][O₄]^8-

• Class: Spinel subgroup < Oxyspinel group < Spinel supergroup
• Class: Oxide
• Variety: Hydromagnetite (+H2O)
• Soluble in: HCl
• Magnetism: Ferrimagnetic
• Alter to Maghemite by weathering.
• Substitution pseudomorph: Replace Hematite.

• Fe²⁺ => Mg: Magnesioferrite (Series)
• Fe²⁺ => Mn: Jacobsite (Series)
• Fe²⁺ => Zn: Franklinite
• Fe²⁺ => Ni: Trevorite
• Fe²⁺ => Cu: Cuprospinel
• Fe²⁺ => Ge: Brunogeierite
• Fe²⁺ => Ti: Ulvöspinel (Ulvospinel)

• Fe³⁺ => Al: Hercynite
• Fe³⁺ => Cr: Chromite (Series)
• Fe³⁺ => V: Coulsonite
• Fe³⁺ => (Fe,Ti,[]): Titanomaghemite

• O => S: Greigite

• Color: Black
• Streak: Black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Octahedral, Rectanglar

• Cleavage: No, Parting on {111} (4 planes)
• Hardness: 5.5-6.5
• Density: 5.2

• System: Cubic
• Group: m3m, Fd3m
• Lattice: a=8.4

Etymology: Magnet