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Geodes are common crystal structures found deep in caves. They are the only source of calcite, and amethyst clusters. They will be featured in the 1.17 - Caves and Cliffs update. The geode blocks are movable but will stack in creative and survival mode. The blocks when found are likely to have amethyst growing on them at a time. Amethyst Geodes have been available since Minecraft: Java Edition snapshot 20w45a, the first snapshot of Caves and Cliffs. In snapshot 20w45a, amethyst geodes has a high generation rate and are very common, possibly being the most common underground structure in Minecraft, and can sometimes be exposed on the surface, just like ocean ruins on beaches.
Amethyst geodes generate underground anywhere between sea level and bedrock. It is possible that they can even break bedrock when they spawn. It overrides cave and ravine generation and abandoned mineshafts as well as other structures, but sometimes can be overridden by other structures. However, they can also be sometimes exposed on the surface, most commonly in oceans and beaches, just like underwater ruins. They can also be exposed in any biome if the height level is below Y=75.
Amethyst geodes consist of a hollow shell of blocks of amethyst with budding amethyst blocks randomly generated throughout it. Amethyst crystals generate within the structure on a budding amethyst block. Surrounding the amethyst is a shell of calcite, which is then surrounded by a shell of smooth basalt. Geodes have a 95% chance of generating with a crack.[more information needed] They generally have a large chunk removed from themselves. Caves cannot cut into geodes, and as such are often obstructed by them except in very rare cases where the giant removed chunk intersects with a cave.