Energy Crystals are light blue gem-like crystals. These crystals are able to produce energy, and are as well resilient to energy attacks, like laser energy, which they can absorb and convert into a golden aura. However, these crystals are not unbreakable and will break when subjugated to hard enough physical impacts. These crystals are as well tightly connected to the eco-system of Mobius, as the extraction of too much enough active Energy Crystal at once will destroy Mobius's whole eco-system.
Seeking to replace his dwindling oil supply, Dr. Robotnik had his forces in the Crystal Mine get ready to extract a colossal Energy Crystal with a crane that was supposed to pull the Energy Crystal up to the surface, either unaware or not caring that removing an active crystal like that would destroy Mobius's entire eco-system. However, with assistance from Sir Charles, the Knothole Freedom Fighters hijacked the mine's Dinobot and used its lasers to cut the ropes that supported the Energy Crystal. As a result, the Energy Crystal fell back into the mine and shattered. What happened to its remains after that is unclear.