Amethyst geode



Amethyst geodes are underground structures which serve as the only source of amethyst items and blocks, tuff, and calcite.

Generation
Amethyst geodes generate underground anywhere between sea level and bedrock. It is possible that they can even break bedrock upon spawning. It overrides cave and ravine generation and abandoned mineshafts as well as other structures but sometimes can be overridden by other structures.

Structure
Amethyst geodes consist of a hollow shell of blocks of amethyst with budding amethyst blocks randomly generated throughout. Amethyst crystals generate within the structure on budding amethyst. Surrounding the amethyst is a shell of calcite, which itself is surrounded by a shell of tuff. Geodes have a 95% chance of generating with a crack, exposing its inside. Caves cannot cut into geodes, and as such are often obstructed by them, except in cases where the crack intersects a cave.

Trivia

 * Despite being called structure, It still generates even if "Generate Structures" feature is off.

Reference
Amethystgeode Géode d'améthyste Geody ametystowe Ametista geodo โพรงผลึกแอเมทิสต์ 紫晶洞 Amethyst Geode