Tellurium

"This rare metal is foreign to the Origin System and can only be found in asteroids that have made the long journey from other stars."

- -In-Game Description

Tellurium is a rare component, and is dropped by Archwing enemy units, or as an Alert reward. As of Update 17, Tellurium can be aquired on Uranus.

Tellurium was added in Update 15.7.2.

Blueprints Requiring Tellurium
Click to view the Blueprints requiring Tellurium 

Market
"By purchasing this item you can directly exchange 10 for 1 Tellurium."

- In-Game Description

Tips

 * As of Update 17.0.2, Ophelia, Uranus is recommended to farm since it is an Archwing submersible mission where normal ground enemies can still drop Tellurium.
 * The submersile Dark Sector missions on Uranus are an alternative for those players who rather want to fight Infested instead of Grineer. The Infested will drop Tellurium as it is considered an Archwing submersible mission and the players will additionally receive a resource bonus of 25% alongside an XP bonus of 18% and a bonus credit reward for playing the Dark Sector mission.

Trivia

 * Tellurium (symbol: Te) is the 52nd element in the periodic table. Its in-game description alludes to the fact that Tellurium is believed to be more common in the universe than it is on Earth.
 * In real life, Tellurium is silver-white in color as opposed to red.
 * Some of the applications for Tellurium include Alloy Metallurgy, Semi-Conductors and Laser Optics. The latter may explain the Itzal's stealth mechanics and laser drones.

Oxium Tellure