Amethyst Geodes were added in the 1.17 Caves and Cliffs Part 1 Update and in my opinion they were a great addition to the game. 3 different blocks spawn in the amethyst geode that can be collected by the player (excluding the clusters and the budding): Block of Amethyst, Calcite, and the outer layer, Smooth Basalt (the original outer layer was made from Tuff, but that was changed in 1.17 Snapshot 21w08a. If you want to see the clusters growing on budding amethyst, consider checking out my other design: https://www.pixelpapercraft.com/papercraft/6159a46a3fcf6d17fc66388a/budding-amethyst-with-crystals-advanced

Credits: I got the textures from the Pixel Papercraft Block Generator: https://generators.pixelpapercraft.com/generator/minecraft-block

More info on Amethyst Geodes: https://minecraft.fandom.com/wiki/Amethyst_geode