BreakBlocker

Note: This mod probably won’t receive any more updates. If you need an up-to-date version of something like this, use Tweakeroo, as it has a feature that functions similar to this mod.

BreakBlocker is a fabric client-side mod that prevents you from breaking specific blocks of your choice. 

This mod is decently customizable, configurable, and has a client-side command system for changing things in-game. BreakBlocker works on singleplayer, and multiplayer. It can be used for many things, such as mining amethyst geodes, preventing yourself from breaking chests, or modpacks. If you would like to learn more about how to use this mod, refer to the wiki.

Mining out an amethyst geode

Clearing grass

Removing every other block in a floor design

If you have any questions or issues, let me know in the comments!

Feel free to use this mod in modpacks!