Though not as edible as they sound, Semimetal Wafers are still important for Starfield players who want to fill their ship and outpost storage bays with useful crafting materials. Unlike planetary materials, these are much harder to find and generally more valuable in terms of outright Credit pricing.
Starfield: Where to Get Semimetal Wafer
Semimetal Wafers are much rarer compared to some other resources in Starfield, but they aren't impossible to find.