Element 115

The is one of the four crystal Meteorite Artifacts found in Tomb Raider III. It was fashioned from a meteorite by Polynesians, that impacted upon Antarctica many years ago.

Taken from Antarctica by one of the sailors from the HMS Beagle to North America, it somehow was obtained by the U.S. Government, and it resided in Area 51 before Lara stole it.

Trivia

 * Element 115 has also appeared in the game Call of Duty: World at War, and Black Ops 1 and 2's Zombies mode, as the very energy source that was used for weapon technology, teleportation experiments, and creating the zombies.
 * Additionally, an alien substance known as Elerium-115 plays an important role as primary resource in the X-COM franchise. It also appears to be crystalline in form and is highly sought after (and recovered samples are usually well-protected.)

Element_115