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Galaxite [abbr. Glx ]

Year of discovery: 1932 (Bald Knob deposit, USA), 1931 (Japan)

Locality list: 40 localities of galaxite

• MnAl₂O₄
• (Mn,Fe,Mg)(Al,Fe)₂O₄
• [Mn²⁺][Al³⁺₂][O₄]^8-

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

• Mn => Mg: Spinel
• Mn => Zn: Gahnite
• Mn => Fe: Hercynite
• Mn => Be: Chrysoberyl

• Al => Cr: Manganochromite
• Al => Fe: Jacobsite
• Al => V: Vuorelainenite
• Al => Mn: Hausmannite

• Color: Dark brown, Red
• Streak: Reddish brown
• Luster: Vitreous
• Diaphaneity: Opaque

• Habit: Octahedral

• Cleavage: Indistinct
• Hardness: 7.5
• Density: 4.2

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