| Ulvöspinel | |
|---|---|
 Ulvöspinel from Apollo 12 landing site, Oceanus Procellarum (Ocean of Storms) | |
| General | |
| Category | Oxide minerals Spinel group Spinel structural group |
| Formula | TiFe2+2O4 |
| IMA symbol | Uspl |
| Strunz classification | 4.BB.05 |
| Crystal system | Cubic |
| Crystal class | Hexoctahedral (m3m) H-M symbol: (4/m3 2/m) |
| Space group | Fd3m |
| Identification | |
| Color | Iron-black, brown in reflected light |
| Crystal habit | Commonly as an exsolution in magnetite |
| Mohs scale hardness | 5.5 – 6. |
| Luster | Metallic |
| Diaphaneity | Opaque |
| Specific gravity | 4.78 |
| References | [1][2][3][4] |
Ulvöspinel orulvite is an iron titanium oxide mineral with formula:Fe2TiO4 or TiFe2+2O4. It forms brown to black metallicisometric crystals with aMohs hardness of 5.5 to 6. It belongs to thespinel group of minerals, as doesmagnetite, Fe3O4.
Ulvöspinel forms assolid solutions with magnetite at high temperatures and reducing conditions, and grains crystallized from somebasalt-gabbro magmas are rich in the ulvöspinel component. The ulvöspinel component tends to oxidize to magnetite plusilmenite during subsolidus cooling of the host rocks, and the ilmenite so produced may form apparentexsolution (trellis type) laminae inmagnetite. 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 toplate tectonics because magnetite is an important recorder of rock magnetism.
Ulvöspinel was first described by Fredrik Mogensen (1904–1978)[5] from adolerite 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 inkimberlites, in some reduced iron-bearingbasalts and is common inlunar basalts.
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