The crystals are a power source used by the Defiant to power certain weapons. These crystals can be found on any planet, but are more common on the planet Crystal. The crystals are purple and sharp. They are found in the snowy regions.
In order to extract the power from the crystals, the Defiant must go through a lot of work. First, they have to take the crystal out of the ground. They then have to bring the crystals to a Crystal Extraction Facility. Once there, they put the crystals into a large machine. The machine then sucks the power out of the crystals. On the other end of the machine, the crystal is returned, but it is now white. They then bring the crystals to the Sharding Room. Here, they cut the crystals up into tiny pieces, which they use as ammo for certain weapons.