Dropped by various air, storm, and lightning themed creatures, such as:
- Steam Rager and Enraged Tempest in Borean Tundra
- Stormrider and Scion of Storm in The Storm Peaks
- Ionar and Stormfury Revenant in Halls of Lightning
- Tempest Revenant in Wintergrasp
Found while mining Titanium Veins.
Crystallized Air as an ingredient