NSKN are publishing my next game :)
Omega Centauri Published in 2014
There are two Quest cards that require delivering any resource plus a Crystal Chit. The quest result says to remove a Crystal from the game.
Do you remove a Crystal from the board in addition to the one you just turned in?
What happens if there are currently no other Crystals on the board?
Just remove the crystal you turned in to complete the quest.
This crystal is removed from the game - usually resources you hand in to complete quests go in the pile to be recycled (when that chit gets drawn).