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From Wikipedia, the free encyclopedia
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.
Magnesioferrite | |
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![]() Magnesioferrite from Ochtendung, Eifel, Germany | |
General | |
Category | Oxide minerals Spinel group Spinel structural group |
Formula (repeating unit) | Mg(Fe3+)2O4 |
IMA symbol | Mfr[1] |
Strunz classification | 4.BB.05 |
Crystal system | Cubic |
Crystal class | Hexoctahedral (m3m) H-M symbol: (4/m 3 2/m) |
Space group | Fd3m |
Unit cell | a = 8.3866 Å; Z = 8 |
Identification | |
Color | Black to brownish black |
Crystal habit | As octahedral crystals, massive granular |
Twinning | Twin plane {111}, contact twins |
Cleavage | On {111} |
Fracture | Uneven |
Tenacity | Brittle |
Mohs scale hardness | 6 - 6.5 |
Luster | Metallic, semimetallic, dull |
Streak | Dark red |
Diaphaneity | Opaque, transparent in thin fragments |
Specific gravity | 4.55 – 4.65 measured |
Optical properties | Isotropic |
Refractive index | n = 2.38 |
Other characteristics | Magnetic |
References | [2][3][4] |
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.[2]
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