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Cobalt (6mm Cube)
An inert acrylic placeholder for Ununseptium, element 117 also known as Tennessine. 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 Ts is impossible to obtain.