Vortex Brick

Vortex Fragments feed the ranged endgame armor and the weapons that go with it, so nobody should be laying these before that is done. Repeat runs of the Lunar Events make the price stop mattering, and at that stage this is just a block.

The green tint and the self lighting make it read as technology rather than stone, which is why it turns up in ship hulls and reactor rooms. Mixed with the other fragment bricks it clashes badly. Used on its own for a full structure it holds together.