renewable-resources/data/renewable/recipe/budding_amethyst.json

{
  "type": "minecraft:crafting_shaped",
  "category": "building",
  "pattern": [
    "CCC",
    "CAC",
    "CCC"
  ],
  "key": {
    "C": "minecraft:calcite",
    "A": "minecraft:amethyst_block"
  },
  "result": {
    "id": "minecraft:budding_amethyst",
    "count": 1
  }
}