Formula(repeating unit) Mg(Fe)2O4 | Strunz classification 4.BB.05 Space group Fd3m | |
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Category Oxide mineralsSpinel groupSpinel structural group Crystal class Hexoctahedral (m3m)H-M symbol: (4/m 3 2/m) | ||
Magnesioferrite is a magnesium iron oxide mineral, a member of the magnetite series of spinels. Magnesioferrite crystallizes as black metallic octahedral crystals. It is named after its chemical composition of magnesium and ferric iron. The density is 4.6 - 4.7 (average = 4.65), and the diaphaniety is opaque. Occurs as well-formed fine sized crystals or massive and granular. Its hardness is 6-6.5. It has a metallic luster and a dark red streak.
Occurrence
It occurs in fumaroles, as a result of combustion metamorphism and coal seam fires, in glass spherules related to meteorite impacts, and as accessory phase in kimberlites and carbonatites.
References
Magnesioferrite Wikipedia(Text) CC BY-SA