Crystal

Crystals are obstacles that appear as translucent rock. Crystals can contain objects and their main purpose is to serve as blockades. Despite there being different types of crystal-related objects, all of them need Rock Pikmin or bomb rocks to be broken; other Pikmin types will just tap away, only to give up after a bit. Gates made of it are called crystal gates. Some fanon games feature glass, which is usually identical to crystal, and ice, which is similar to crystal but can freeze upon contact.

Large crystals can contain fruits, fragments, data files, and even spray nectar and Onions. Small crystals don't contain major objects, usually just pellets, but they can block geysers. Crystal nodules are very small crystals that are usually weaponized by enemies, most notably Skutterchucks, and are sometimes present in large, seemingly inexhaustive piles called crystal nests. Crystal stalactites hang from ceilings and fall when leaders or Pikmin pass underneath them.

=In fanon games=

In Pikmin 2... Again?
Crystal return in Pikmin 2... Again?. They work like as in. But in addition, crystal nodule can have objects inside or be rolling. Another form is the amethyst, being purple unlike normal crystal, amethyst covers caves until another is complete so there's no way to choose the cave the player wants to go at. But also amethyst gates that if there's no amethyst covering the cave holes, then it'll be those covering the path instead. A amethyst gate also gets destroyed after beating the Nightmare Den which the Original Pikmin will be discovered.

In Pikmin: Dual Worlds
Crystals appear in Pikmin: Dual Worlds exactly as they do in. Horned Skutterchucks can obtain crystal nodules, which are found in Feverpitch Forest and Quinacridone Quarry, from certain crystalline structures such as large crystals and crystal nests.