{
  "feature": "serilis:rock_placed",
  "placement": [
    {
      "type": "minecraft:count",
      "count": 3
    },
    {
      "type": "minecraft:rarity_filter",
      "chance": 1
    },
    {
      "type": "minecraft:in_square"
    },
    {
      "type": "minecraft:heightmap",
      "heightmap": "WORLD_SURFACE_WG"
    },
    {
      "type": "minecraft:biome"
    },
    {
      "type": "minecraft:block_predicate_filter",
      "predicate": {
        "type": "minecraft:all_of",
        "predicates": [
          {
            "type": "minecraft:matching_blocks",
            "blocks": ["minecraft:air"]
          },
          {
            "type": "minecraft:not",
            "predicate": {
              "type": "minecraft:matching_blocks",
              "blocks": [
                "minecraft:ice",
                "minecraft:blue_ice",
                "minecraft:packed_ice",
                "minecraft:packed_ice",
                "minecraft:sand",
                "minecraft:red_sand",
                "minecraft:end_stone"
              ],
              "offset": [0, -1, 0]
            }
          }
        ]
      }
    }
  ]
}