Crystal Poptop Egg
Crystal Poptop Egg is an uncommon one-handed throwable item.
Can be used to spawn a creature called crystal poptop.
These “eggs” are really just highly incubated versions of creatures, used by altas during research, often for simulation purposes, which is why they tend to be friendly to their owner.
Ingame
Species descriptions:
- Alta: A brave little crippit is ready to settle in its new crystal home!
Sources
Can be obtained via 
Spawnable Item Pack or 
Technical Information
- In-game ID:
ct_crystal_poptop_egg - Power:
2.5 - Rarity:
Uncommon - Tags:
monster_egg,spawner,throwable,uncommon - File:
/items/active/alta/spawners/monsters/ct_crystal_poptop_egg.activeitem