A Block of Amethyst is a block found in amethyst geodes or crafted from amethyst shards. It has the unique ability to copy and 'repeat' vibrations received by adjacent sculk sensors. It can be mined using any pickaxe, and when mined with other tools, it drops nothing. It generates naturally within the walls of amethyst geodes, with calcite and smooth basalt surrounding it.

When placed next to a sculk sensor or a calibrated sculk sensor, the Block of Amethyst re-emits vibrations that can be detected by another sculk sensor, allowing for wireless signal transmission. Additionally, it emits a quiet overlay sound when interacted with and a block breaking sound when hit by a projectile.