{
  "variants": {
      "": [ { "model": "block/cobblestone","weight": 12 },
            { "model": "block/cobblestone_1","weight": 2 },
            { "model": "block/cobblestone_2","weight": 3 },
            { "model": "block/cobblestone_3","weight": 6 }

           ]
  }
}