src/main/resources/assets/mekanismtools/recipes/obsidianaxe.json

{
  "result": {
    "item": "mekanismtools:obsidianaxe"
  },
  "pattern": [
    "XX",
    "XT",
    " T"
  ],
  "type": "mekanism:ore_shaped",
  "key": {
    "T": {
      "item": "minecraft:stick"
    },
    "X": {
      "ore": "ingotRefinedObsidian",
      "type": "forge:ore_dict"
    }
  }
}