Astronium

Astronium is a rare resource in Astroneer. Astronium appears as iridescent clusters, fading from green in the center to fuchsia on the edge.

Source
Astronium can be found in the outer core layers of all planets.

Uses
Astronium can be researched for 1000 bytes over 25 minutes, or 40 Bpm per nugget, but currently has no use in crafting.

In the EXO Automated Mass Production Protocol event, the player can send Astronium through the EXO Request Platform after finishing the main milestones and will receive a care package every 50 Astronium sent.

In the Project CHEER Delivery LTE, the player could craft Cosmic Baubles in a Small Printer by combining Astronium and Scrap.

Trivia

 * Before Patch 1.0, Astronium deposits were a bright fuchsia, before being changed to their current gradient appearance, but the nuggets remained fuchsia. The nuggets' color were also once green before being later changed to purple and eventually, in Patch 1.0.15, changed to the gradient color we see now.
 * Astronium used to be found in small quantities on the surface of Radiated, and was easiest to find on Radiated for this reason. After Patch 1.0, Astronium was only found in the outer cores of each planet.

Media
Astronium Astronio アストロニウム Astronium