Tags: Chemical Substance, Mineral.
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.