Ulvöspinel or ulvite is an iron titanium oxide mineral with formula: Fe2TiO4 or TiFe2+2O4. It forms brown to black metallic isometric crystals with a Mohs hardness of 5.5 to 6. It belongs to the spinel group of minerals, as does magnetite, Fe3O4.

Ulvöspinel from Apollo 12 landing site, Oceanus Procellarum (Ocean of Storms)
CategoryOxide minerals
Spinel group
Spinel structural group
(repeating unit)
Strunz classification4.BB.05
Crystal systemCubic
Crystal classHexoctahedral (m3m)
H-M symbol: (4/m 3 2/m)
Space groupFd3m
ColorIron-black, brown in reflected light
Crystal habitCommonly as an exsolution in magnetite
Mohs scale hardness5.5 - 6.0
Specific gravity4.78

Ulvöspinel forms as solid solutions with magnetite at high temperatures and reducing conditions, and grains crystallized from some basalt-gabbro magmas are rich in the ulvöspinel component. The ulvöspinel component tends to oxidize to magnetite plus ilmenite during subsolidus cooling of the host rocks, and the ilmenite so produced may form apparent exsolution (trellis type) laminae in magnetite. The texture was once interpreted as indicating solid solution between ilmenite and magnetite, until the oxidation reaction and resultant textures were reproduced in laboratory experiments first described by Buddington and Lindsley (1964, Journal of Petrology 5, p. 310-357). The results are important to plate tectonics because magnetite is an important recorder of rock magnetism.

Ulvöspinel was first described by Fredrik Mogensen (1904-1978) [5] from a dolerite layered intrusion in the Ulvö Islands, Ångermanland, Sweden in 1943. The locality is an iron, titanium and vanadium mining area that has been active since the 17th century.[6] It is common in titaniferous magnetite iron ore deposits. It also occurs in kimberlites, in some reduced iron-bearing basalts and is common in lunar basalts.


  1. http://www.mindat.org/show.php?id=4089 Mindat
  2. http://rruff.geo.arizona.edu/doclib/hom/ulvospinel.pdf Handbook of Mineralogy
  3. http://webmineral.com/data/Ulvospinel.shtml Webmineral data
  4. https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Ulv%F6spinel Mineralienatlas
  5. "Fredrik K Mogensen".
  6. Mogensen, Fredrik (1946). "A ferro-ortho-titanate ore from Södra Ulvön". Geologiska Föreningen i Stockholm Förhandlingar. 68 (4): 578–587. doi:10.1080/11035894609446484.

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