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Magnesiochromite

Year of discovery: 1868 (Schwarzenberg District, Germany), 1947 (Japan)

Locality list: 41 localities of magnesiochromite

• MgCr₂O₄
• (Mg,Fe)(Cr,Al,Fe)₂O₄
• [Mg²⁺][Cr³⁺₂][O₄]^8-

• Class: Spinel subgroup < Oxyspinel group < Spinel supergroup
• Class: Oxide

• Mg => Fe: Chromite (Series)
• Mg => Mn: Manganochromite
• Mg => Co: Cochromite
• Mg => Zn: Zincochromite

• Cr => Al: Spinel (Series)
• Cr => Fe: Magnesioferrite
• Cr => V: Magnesiocoulsonite

• Color: Black, Dark brown
• Streak: Brown
• Luster: Greasy
• Diaphaneity: Opaque

• Habit: Octahedral

• Cleavage: No, Parting on {111} (4 planes)
• Hardness: 5.5
• Density: 4.2

• System: Cubic
• Group: m3m, Fd3m
• Lattice: a=8.3

Synonym: Chrome-spinel, Cr-spinel