Beryllium
From Tardis Wiki, the free Doctor Who reference
Beryllium was a metallic element used in the manufacture of beryllium chips, which were used in some atomic clocks. (TV: Doctor Who) It is created inside the stars and is a relatively rare element in the universe.
The members of the United Front were armed with beryllium laser rifles. This type of weaponry was eventually banned in the 2020s. (AUDIO: The Fearmonger)
