Resources refer to items that are mostly used to craft other, more important items.
Ingots:
From Ore: Malachite, Nickel, Aluminum, Silver, Lead, Zinc, Carbon (Fuel Source), Tin, Copper, Cobalt, Adamantium, Elemental, Magnetite, Titanium, Uranium, Platinum
Not Smelted from Ore: Bronze(Crafted w/ Tin & Copper), Iridium(Smelted from Meteorite Shards), Elemental (Earth, Water, Air, Fire - Made from Shards), Night Steel(Crafted w/ Onyx & Elemental Ingot), Enderic Alloy(Crafted w/ Enderite & Selenite), Valyrian Steel(Made w/ Dragon's Breath, Silver, & Night Steel), Extraterrestrial Metal(Made w/ Gold, Selenite, & Meteorite Shards), Asgardian Steel (Crafted w/ Steel & Extraterrestrial Ingots), Durasteel(Made w/ Obsidian & Carbon), Dwarven(Dropped by Dwarven Miner & Dwarven Golem), Plutonium (Made w/ Neutrons & Uranium), Asteroid Ingot(Crafted using Wormholes)
Gems:
Meteorite, Enderite, Ultrafood, Superfood, Amber, Onyx, Seasonal, Ruby, Peridot, Amethyst, Vibranium, Dwarf Star Alloy, Slime, Energetic Orb, Ancient Locket, Selenite, Beryl, Earth Gem
Not Made from Ore: Power, Space, Reality, Soul, Time, and Mind Stones, Portal Stone, Ender Stone, Pulsating Shard, Slime Gems (Enchanted, Infused, & Magical), Charged Beryl, Kyber Crystal, Moon Gem, Solar Gem, Dwarven Gem (Dropped by Dwarven Guards)
Nuggets:
Carbon Nugget, Dwarven Nugget
Technology-Related Items: Silicon Chunk, Silicon, Concrete Dust, Aluminum and Nickel Sheets, Polymer, Electronics, Computer Chip, Control Panel, Visor, Wires (Copper, Aluminum, Basic, Advanced, Prominent), Batteries (Basic, Advanced, Prominent), Atomic Splicers (Atomic Splicer, Charged Atomic Splicer, Electron Splicer, Neutron Splicer), Atom, Electron, Basic Gravitational Compressor, Minor Wormhole, Dark Matter, Neutron, Solar Gas, Lead Lining, Platinum Wiring, Nuclear Battery
Shards: Meteorite Shards, Elemental (Earth, Water, Air, Fire), Ice Shards, Infused Ice Shards, Earth Meteorite Shards (Iron, Silver, Gold, Platinum)
Mob Drops: Frozen Flesh (Frozen Zombie), Dust Bone (Arid Skeleton), Ice Shards (Several Evolved Arctic Mobs), Krampus Cloth (Krampus), Hardened Scales
(Cactus Bug & Basilisk), Basilisk Eye (Basilisk), Eye of Immjiri (Dwarven Hunter), Dwarven Ingot (Seen Above), Minotaur Hide (Minotaur), Minotaur Horn
(Minotaur, Brews Quick Attack Potion), Minotaur Heart (Minotaur, Gives you Health Boost 1 Until Death), Dwarven Pickhoxel (Dwarven Miner), Dwarven Gem
(Dwarven Guard), Dwarven Mechanism (Dwarven Golem), Raw Lion Meat, Lion Hide, Lion Tooth (Lion), Direwolf Pelt (Direwolf), Mane Hair (Dropped
Naturally by Lions)
Misc: Imbued Rod, Godly Rod, Shattered Soul, Soul, Ballistic Nylon, Curious Powder, Blue Moon Quartz, Mysterious Moss Ball, Dragonglass, Mug, Jedi & Sith Cloths, Pile o' Pelt, Hide Bundle, Dwarven Rod, Dusk Cloth
Effecting Items: Minotaur Heart (Gives you Health Boost 1 until Death), Strength Crystal Tier 1 (Gives Strength 1 until Death)
Lockets: Ancient Locket, Amber Locket, Overworld Locket, Earth Locket
Boss Items:
The Beast - Pulsating Shard (Important Drop)
Basilisk - Basilisk Eye (Important Drop)
Immjiri - Offering to Immjiri (Spawn item), Immjiri Tear (Important Drop)
Earth Guardian - Earth Horn (Spawn Item), Earth Tablet (Important Drop), Terra (Important Drop)
Knowledge Lord - Ancient Book (Spawn Item), Ancient Locket (Important Drop), Vacuous Sword (Important Drop)