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Polydymite: NiNi2S4
Comments: Octahedral crystals of polydymite on matrix. Location: Grüneau Mine (Grüne Au Mine; Grünau Mine), Schutzbach, Betzdorf, Siegen District (W), Rhineland-Palatinate, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag