Erestrum Ore can be found on the planets Aitis and Aestus .
Since update Alpha 5.0.0 Erestrum Ores can be set as Asteroids in Asteriod Rings and Asteroid Fields as well. One Asteroid contains about 2,500 to 3,000 ores in average.

Planet Aestus
Ore | Ore Icon | Makes | Ingot Icon |
---|---|---|---|
5 x Erestrum | ![]() | 10 x Erestrum Ingots | ![]() |