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Formula: Fe2+2TiO4
Multiple oxide, ulvöspinel subgroup,
oxyspinel group,
spinel supergroup,
titanium-bearing mineral,
forms a series with qandilite
Crystal System: Isometric
Specific gravity: 4.78 calculated
Hardness: 5½ to 6
Colour: Iron-black, brown in reflected light
Luminescence: Not fluorescent under UV
Environments
Igneous environments
Extraterrestrial
Ulvöspinel is a common component of titaniferous
magnetite iron ores; it also
occurs in kimberlites, in strongly reduced
iron-bearing basalts and in
terrestrial
and lunar environments. Associated minerals include iron,
magnetite, troilite,
cohenite, graphite,
ilmenite, pyrrhotite,
chalcopyrite, olivine,
pyroxene, biotite,
plagioclase and apatite
(HOM).
ulvöspinel is an oxyspinel that commonly occurs as an exsolution product, forming a fine network in
magnetite, or in ilmenite
(Mindat).
Localities
The type locality is the Grundhamn mine, Södra Ulvön, Örnsköldsvik, Västernorrland County, Sweden.
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