Dilithium Crystals Could Power Hypothetical, Star Trek-Style Warp Drive
►http://www.wired.com/wiredscience/2012/10/dilithium-crystals-warp-drive
The dilithium of Star Trek was not merely a molecule with two atoms of lithium, though — it was always described as its own element, and a periodic table seen in one episode listed it as having atomic weight 87 (which would place it between Rubidium and Strontium if its atomic number followed normal convention, but we can probably assume that dilithium is a bit unusual and obeys laws of molecular physics as yet unknown to our primitive science).