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Tegengrenite: (Mg,Mn++)2Sb+++++0.5(Mn+++,Si,Ti)0.5O4
Comments: Red, pseudo-octahedral crystal of tegengrenite in quartz. Location: Jakobsberg, Nordmark, Filipstad, Värmland, Sweden. Scale: Picture size 0.8 mm. © Thomas Witzke / Abraxas-Verlag