Alien crystal

Alien Crystals are items which are added to Fallout 3 in the Mothership Zeta add-on.

About
Alien Crystals come in two variations; Small Alien Crystals and Large Alien Crystals. They are only found aboard Mothership Zeta.

No one on Earth has discovered in what way the aliens truly make use of these crystals. Speculation ranges from some form of alien currency, ammunition for alien weapons unavailable to the Lone Wanderer, or an alien energy source for the various devices that are often encountered next to the crystals themselves (devices which can not be identified or picked up).

Though humans may not be able to harness the true power of these crystals, they can be sold in bulk back in the Wasteland for a reasonably large amount of caps or used as a weightless and fairly plentiful source of Rock-It Launcher Ammunition. Also, some people may consider them quite pretty, and they can be used as decoration.