{
  "format_version": "1.13.0",

  "minecraft:ore_feature": {
    "description": {
      "identifier": "ore_features:ore_feature"
    },

    "count": 25,
    "replace_rules": [
      {
        "places_block": "minecraft:glass",
        "may_replace": ["minecraft:air"]
      },
      {
        "places_block": "minecraft:cobblestone",
        "may_replace": ["minecraft:grass", "minecraft:stone", "minecraft:dirt"]
      }
    ]
  }
}