Crystal Nodules are crystalline formations that act as barriers and hazards (when chucked) in Pikmin 3. These crystals, much like certain walls in the previous titles, required specific Pikmin types to break. The same principal applies to these crystal barriers; only Rock Pikmin can break through the hard structures, thanks to their rock-hard bodies. It takes twelve hits from Rock Pikmin to break.
The small crystal balls that Skutterchucks can pick up are also known as Crystal Nodules and found in small groups.