Budding Rose Quartz

Geodes

Rose quartz geodes generate in every Overworld biome, from 6 blocks above the bottom of the world up to Y 30, one per 48 chunks on average. From the outside in: Smooth Basalt, Calcite, then a wall of Block of Rose Quartz in which about every twelfth block is budding. 95% of geodes have a crack in the shell.

Growth

The block works like budding amethyst. On a random tick it has a 1 in 5 chance to pick one of its six sides. If there is air or water on that side, a small bud appears; later picks grow it to medium, large and finally a Rose Quartz Cluster. Harvest the clusters and leave the block where it is: it keeps growing new ones.

It cannot be moved. Mining it gives nothing and a piston breaks it.