ActuallyAdditions/src/main/resources/data/actuallyadditions/loot_tables/blocks/black_quartz_slab.json

{
  "type": "minecraft:block",
  "pools": [
    {
      "rolls": 1,
      "entries": [
        {
          "type": "minecraft:item",
          "functions": [
            {
              "function": "minecraft:set_count",
              "conditions": [
                {
                  "condition": "minecraft:block_state_property",
                  "block": "actuallyadditions:black_quartz_slab",
                  "properties": {
                    "type": "double"
                  }
                }
              ],
              "count": 2
            },
            {
              "function": "minecraft:explosion_decay"
            }
          ],
          "name": "actuallyadditions:black_quartz_slab"
        }
      ]
    }
  ]
}