Crystal Tokens are the main source of Victory Points in the game. There are two numbers on each Crystal Token (see image). One is the mining cost, indicating how difficult it is to Mine the Crystal, the other shows how many Victory Points the Crystal is worth at the end of the game.
Crystals may also have Faction symbols on them. At the end of the game, sets of different symbols are worth additional Victory Points.
Some Crystals also have a Cave-In symbol on them. Mining these Crystals damages the structure of the Mine, increasing the risk of a collapse. When collapse occurs, the game ends.