Copper

Copper is a metal found in the Overworld. It generates naturally as copper ore, which drops raw copper, which can then be smelted into copper ingots. Copper is known for oxidation, and copper ingots are a crafting incredient for lightning rods, brushes, and spy glasses.
Items
Copper Ingot - an item created by smelting raw copper or killing drowned.
Copper Nugget - obtained by smelting copper tools and armor.
Raw Copper - an item dropped from mining copper ore.
Blocks
Copper blocks oxidize over time, gaining a verdigris appearance over four stages. They can be prevented from oxidizing by being waxed with honeycombs, and returned to previous oxidation stages using an axe.
Block of Raw Copper - a block used for compact raw copper storage.
Copper Ore - an ore that can be found underground.
Deepslate Copper Ore - the deepslate variant of copper ore.
Lightning Rod - a block used to divert lightning strikes.
- It is the only copper block that does not oxidize.
Copper Golem Statue - a block created when a copper golem fully oxidizes.
Copper - an element in Minecraft Education and Bedrock Edition.
Mobs
Copper Golem - a buildable mob that takes items from copper chests and sorts them into regular chests.
- It also oxidizes over time.
Gear and tools
Spyglass - an item crafted with copper ingots and an amethyst shard that can be used to zoom in on distant objects.
Brush - a tool crafted with a stick, a copper ingot and a feather. It can be used to brush suspicious blocks and can also be used on armadillos to obtain armadillo scutes.
Copper Axe
Copper Hoe
Copper Pickaxe
Copper Shovel
Copper Sword
Copper Helmet
Copper Chestplate
Copper Leggings
Copper Boots
Structures
Trial Chambers - Overworld underground structures made out of waxed blocks of copper and their oxidized variants, containing combat challenges in the form of trial spawners.
Mentioned
Copper Button - an unimplemented block that would have been added if the Copper Golem had won the mob vote at Minecraft Live 2021.
Removed
Copper Horn - an item that could play different melodies depending on which goat horn it was crafted with.
April Fools
Copper Spleaves - a joke item in Java Edition 23w13a_or_b which broke upon contact with entities, found in Lunar Bases.
Copper Sink - a joke item in Java Edition 23w13a_or_b which could delete copper-based items.
Filled Copper Sink - the filled version of the copper sink in Java Edition 23w13a_or_b which could delete copper-based items.