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.

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