Mercury

Mercury (Hg) was a liquid metal element at room temperatures. It was poisonous to Humans; however some lifeforms like the Polydroxols evolved in mercury-rich environments. It flowed on the Cinnabar Moon. The mantle and much of the surface of Fiddanl in the Yavin system was composed of a massive sea of boiling mercury.

On board the Lido Deck of the Galaxy Tours luxury liner, Kuari Princess, passengers were able to swim in a competition-sized swimming pool that contained mercury and ammonia.