The Blue Crystal Cave is the only place where players can mine Blue Crystals. It is a cavern with a pool in the middle illuminated by a large, white crystal and has an elevated area.
The blue crystal cave is located at the end of the right fork of the Crystal Cavern and is unlocked by using Bolt Cutters on the door at the end. The door is too small to fit any Hovercars inside.
The Crystal Cave spawns up to 4 Blue Crystals, and once mined, they will respawn from time to time. The Blue Crystals spawn on the walls of the cave.