{
    "feature": "infinity_cave:amethyst_caves/calcite_rim",
    "placement": [
      {
        "type": "minecraft:count_on_every_layer",
        "count": 8
      },
      {
        "type": "minecraft:biome"
      },
      {
        "type": "minecraft:random_offset",
        "xz_spread": 0,
        "y_spread": -1
      }
    ]
  }