{
    "processors": [
        {
            "processor_type": "minecraft:rule",
            "rules": [
                {
                    "location_predicate": {
                        "predicate_type": "minecraft:block_match",
                        "block": "minecraft:calcite"
                    },
                    "input_predicate": {
                        "predicate_type": "minecraft:random_block_match",
                        "block": "minecraft:grass_block",
                        "probability": 1
                    },
                    "output_state": {
                        "Name": "minecraft:calcite"
                    }
                }
            ]
        }
    ]
}