Copper Trap

A copper trap is a block found in 26w14a.

Although the copper trap has a drop, no vanilla tool is suitable for breaking it, so breaking it with any tool will have no effect. Furthermore, attempting to use Attack / Mine to order a tool to mine it will not happen, as tools only break blocks that they can mine. However, it is still possible to make a copper trap block drop a living copper trap with an explosion.

Using cheats, it's possible to create a tool capable of mining it by modifying minecraft:tool.rules data component. It can also be added to the tag #mineable/pickaxe so that it can be mined by any pickaxe (additionally, adding a tag like #needs_iron_tool prevents it from being mined by some pickaxes.)