Sphalerite

Sphalerite is a raw resource that can be smelted into Zinc, and is found underground on Barren, Exotic. Zinc, in turn, is used to craft some power-related resources, such as Power Cells and Medium Batteries. It is also used to craft all of the Terrain Tool mods: Boost Mod, Wide Mod, Narrow Mod, Inhibitor Mod, Alignment Mod, and the Terrain Analyzer.