These are basic resources that will be available to all players. Any avatar, including Gray ones, will be able to mine them in the game world.
These are resources that can be found in the world, goods with basic features, and components used to produce items of better quality.
Players unlock the production of these items, as well as items of higher quality (purple and orange) as they evolve in the game. Blue items are rare resources, valuable goods with improved features, and goods used as components for production.
These include extremely rare resources (e.g. purple shards), very valuable goods with diverse features, and components for tools production. Tools are the most valuable in-game items of orange quality.