Often times I find these things sticking out of the ocean floor or in 1 block deep water in beaches, or even sticking out of the ground in a field. Adding some way to limit the height/depth at which they can generate would be a nice touch, as well as a config for limiting which biomes they can generate in. On a side note, would you consider using the stepping on and breaking sounds from the 1.17 amethyst blocks and crystals for these blocks, plus the occasional twinkle sounds they emit?