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Hercynite [abbr. Hc ]

Year of discovery: 1839 (Poběžovice, Czech), 1925 (Japan)

Locality list: 84 localities of hercynite

• FeAl₂O₄
• [Fe²⁺][Al³⁺₂][O₄]^8-

• Class: Spinel subgroup < Oxyspinel group < Spinel supergroup
• Class: Oxide
• Variety: Picotite (+Mg, Cr)
• Insoluble in: HCl

• Fe => Mg: Spinel (Series)
• Fe => Mn: Galaxite
• Fe => Zn: Gahnite (Series)
• Fe => Be: Chrysoberyl

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

• Color: Dark bluish green, Brown
• Streak: Dark green
• Luster: Vitreous
• Diaphaneity: Translucent

• Habit: Octahedral

• Cleavage: Indistinct on {111} (4 planes)
• Hardness: 7.5
• Density: 4.4

• System: Cubic
• Group: m3m, Fd3m
• Lattice: a=8.1