ulvöspinel
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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.
Key facts
- Mineral.name
- Ulvöspinel
- Mineral.category
- Oxide minerals Spinel group Spinel structural group
- Mineral.image
- Ulvöspinel-522694.jpg
- Mineral.caption
- Ulvöspinel from Apollo 12 landing site, Oceanus Procellarum (Ocean of Storms)
- Mineral.formula
- TiFe2+2O4
- Mineral.IMAsymbol
- Uspl
- Mineral.strunz
- 4.BB.05
- Mineral.color
- Iron-black, brown in reflected light
- Mineral.habit
- Commonly as an exsolution in magnetite
- Mineral.system
- Cubic
- Mineral.class
- Hexoctahedral (mm) H-M symbol: (4/m 2/m)
- Mineral.symmetry
- Fdm
- Mineral.mohs
- 5.5 – 6.
- Mineral.luster
- Metallic
- Mineral.gravity
- 4.78
- Mineral.diaphaneity
- Opaque
via Wikipedia infobox
Wikidata facts
- Image
- Ulvöspinel-522694.jpg
Show 6 more facts
- Strunz 8th edition (series ID, updated)
- IV/B.01d
- chemical formula
- Fe²⁺₂TiO₄
- Nickel-Strunz 9th edition (updated 2009)
- 4.BB.05
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 4.BB.05
- Commons category
- Ulvöspinel
- IMA Mineral Symbol
- Uspl
via Wikidata · CC0
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Article
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- References
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 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.