Budding Amethyst

Budding amethyst is a block found in amethyst geodes that grows amethyst clusters.

Obtaining
Budding amethysts can currently only be obtained via the Creative inventory or with commands, as they are unobtainable by Survival means.

Breaking
Budding amethyst cannot be obtained when mined, even with Silk Touch or TNT. It will break immediately if pushed by a piston or sticky piston, and cannot be pulled by sticky pistons.

Natural generation
Budding amethyst generates naturally in amethyst geodes as part of the innermost block of amethyst layer.

Usage
Each time it receives a random tick, the chance is similar to the growth of cocoa pods with a budding amethyst having a 20% chance of creating amethyst clusters on any of its sides as long as that particular side is only covered in air or water.

Trivia

 * JAPPA has said the reasoning for the 'x' pattern on the block is because "the plane-crystals grow out of it"