What rare elements would be most needed in building a space station beyond the Earth?

If people were attempting to build a space station beyond the Hill Sphere, (outside of the area where Earth's gravity dominates), and wanted to mine the raw materials for the station from dwarf planets, comets, and asteroids, what rare earth element or mineral would they mostly likely be looking for to building and/or maintaining the station?

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What rare elements would be most needed in building a space station beyond the Earth?

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