Sulfur

Sulfur is a common commodity element: it's description reads:

"Abundant yellow non-metal, most commonly found in the foodstuff of the Gek due to its use in scent gland processes. Occurs naturally with a rectivity that leads to a wide range of use in galactic manufactoring facilities. Often seen adding a splash of color to a Gek Traders's beak."

Relayed to reddit by /u/Pure_Cherubimon