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Cobalt (6mm Cube)
An inert acrylic placeholder for Ununtrium, element 113 also known as Nihonium. This is cast in crystal clear acrylic. The cube measures 50mm and is made by Smart-elements. This is brand new in the box. I only removed it to take photos. This would make a great addition to someones element collection to fill the hole in ones periodic table since an actual sample of Nh is impossible to obtain.