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Tugarinovite: MoO2
Comments: Black shining short-prismatic crystals of tugarinovite on whitish anhydrite with minor blue ilsemannite. Location: Kudriavy (Kudryavyi) volcano, Iturup Island, Kuril Islands, Sakhalinskaya Oblast', Far-Eastern Region, Russia. Scale: FOV is 2x1 mm. © Pavel M. Kartashov