Astronium

is a resource in Astroneer. It can be found on the surface of Radiated Planets and deep underground on Terran, Tundra, Exotic, and Barren Planets. Astronium has no known use as of yet in-game. Once you find an Astronium deposit, you can gather some with your Deform Tool, however a Drill Head is required to mine out the entire deposit similar to Lithium and Titanium.

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Astronium