Phosphorus
Phosphorus is a non-metallic chemical element. One form of phosphorus emits a faint glow. 

Liquid phosphorus comprised one of the atmospheric layers of a Class 7 gas giant discovered by  in 2151. ()  

Crystals found on the  in 2268 were comprised of 35% potassium, 18% carbon, 1.5% calcium and 1% phosphorus – all elements found in the Human body. It was later determined that the crystals were in fact the remains of the Exeter crew. ()

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Elements