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Hematite (Photo) [abbr. Hem ]

Year of discovery: Prehistoric (World), 1876 (Japan)

Locality list: 1,086 localities of hematite

• Fe₂O₃
• α-[Fe³⁺₂][O₃]^6-

• Class: Hematite group
• Class: Oxide
• Soluble in: HCl
• Magnetism: Antiferromagnetic, Paramagnetic (After heating)
• Substitution pseudomorph: Replaced by Magnetite.

• Polymorph: Maghemite (γ, Cubic)

• Fe => Al: Corundum (α)
• Fe => Cr: Eskolaite
• Fe => V: Karelianite
• Fe => Ti: Tistarite
• Fe => Mn: Bixbyite (γ)
• Fe => As: Arsenolite, Claudetite
• Fe => Sb: Sénarmontite (Senarmontite), Valentinite
• Fe => Bi: Bismite, Sphaerobismoite

• Color: Iron black. Reddish brown
• Streak: Reddish brown
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Thin platy

• Cleavage: No, Parting on {0001} and {1011} (4 planes)
• Hardness: 5-6
• Density: 5.3

• System: Trigonal
• Group: (-3)m, R(-3)c
• Lattice: a=5.0, c=13.8

Etymology: Hema (blood) in Greek