Gallium

"Soft metal used in microelectronics and energy weapons."

- In-Game Description

Gallium is a rare component that can be found on Mars and Uranus. It is usually found in quantities of one, but can also found with quantities of 2-3. It is most often found by defeating Sgt. Nef Anyo (Mars, War) or Tyl Regor (Uranus, Titania) rather than normal enemies.

As of Update 10, Gallium can also drop in Orokin Void.

This is most often used in crafting heavy weapons.

Blueprints Requiring Gallium
Click to view the Blueprints requiring Gallium

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

- In-Game Description

Beginning in Update 9 materials could be purchased directly from the market for.

Trivia

 * Gallium is a metal element that is soft with a brilliant silver color in appearance. As suggested in Warframe, it is in use today in electronics due to its performance as a semiconductor.