Thanks for the detailed feedback!
I have added Quartz spawns to Underbark and Sporegrove, which should help with building Nix's shield stacks. This also addresses 2 other issues, since those layers could feel a bit empty with only two resource types previously, and there was generally not enough Quartz in Farfields.
For Bits and Bobs, the sell tab now accepts bars instead of ores, with slightly increased prices to account for furnace fuel costs. Gemstones have also been added to the sell tab. For now, Farfields resources will not be included there, as I want to avoid situations where players accidentally sell materials they might need for future blueprints. Thanks again for enjoying Serenitrove!