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ATHENA

MINERALOGY

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Mineral:TEGENGRENITE
Formula:(Mg,Mn2+)2Sb5+0.5(Mn3+,Si,Ti)0.5O4
Crystal System:Rhomboedral (Trigonal) pseudo Cubic
Group:Spinel supergroup Oxyspinel group. Ulvöspinel subgroup
References:AM 85 (2000), 1315; MR 32/5 (2001), 419
Type Locality:Jakobsberg, Filipstad, Värmland (Varmland, Wermland), Sweden

Tegengrenite
The new mineral Tegengrenite (red) showing red internal reflections, with hausmannite
Jakobsberg, Värmland, Sweden.
Polished section x-nicols. Size 1.5 mm.
Photo © Kjell Gatedal, School of Mines and Metallurgy, Filipstad, Sweden.
See also: athena.unige.ch -> mineral pictures

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