A khaydarin crystal formation is a geological formation where khaydarin crystals can be found.
The zerg raided one such formation (guarded by the Vanguard of Aiur) to retrieve a crystal to enable the Overmind's physical presence on Aiur.
The formation is an invincible protoss special building, sharing the portrait with the khaydarin crystal power-up.
- ↑ 1.0 1.1 StarCraft. Vivendi Games. Mission: The Invasion of Aiur (in English). 1998.