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 dropped primarily by Archwing enemy units, though it may also be dropped by enemies encountered in the Grineer Sealab tileset.

Tellurium was added in.

Blueprints Requiring Tellurium
Click to view the Blueprints requiring Tellurium. 

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

- In-Game Description

Tips

 * As of, Ophelia, Uranus is recommended to farm since it is an Archwing submersible mission where normal ground enemies can still drop Tellurium.

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 (as both Tellurium and the Itzal were introduced in the same update).
 * It is currently one of the few resources that still uses the generic resource container model.

Oxium Tellure

Telurio