Xuan Nu: Three Clusters World Book 03 (2019)

From publisher blurb:

Once, the Orion Arm was humanity's plaything, the Earth Alliance expanding by leaps across interstellar space. But as happens with all our species creates, it was destroyed through greed and lust for power and spite.

A thousand years on, space is still dark, but light sometimes flickers for a while in a little corner here or there. The dream of the Alliance dies hard, and over and over one world or another has tried to recreate a fraction of its glory, only to fail. Whether or not this attempt will finally succeed is up to you and your players.

Xuan Nu is a mining colony, dedicated to exploiting a geochemical quirk that makes it like no other planet. The company is failing, however, and the miners have other ideas about their future that are about to burst into the open. Players will have to work their way between two opposing sides, either joining forces with one or the other or trying to stay neutral as a revolution breaks out.