Owl - coll. P.P. ATHENA

MINERALOGY
mlevy
Mineral:TEGENGRENITE
Formula:(Mg,Mn2+)2Sb5+0.5(Mn3+,Si,Ti)0.5O4
Crystal System:Rhomboedral (Trigonal) pseudo Cubic
Strunz Nr:4/B.05-65
References:AM 85 (2000), 1315; MR 32/5 (2001), 419
Type Locality:Jakobsberg, Filipstad, Värmland (Wermland), Sweden

Tegengrenite
The new mineral Tegengrenite (red) showing red internal reflections, with hausmannite, from Jakobsberg, Värmland, Sweden. Polished section x-nicols. Size 1.5 mm. Photo © Kjell Gatedal, School of Mines and Metallurgy, Filipstad, Sweden.
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