--List of every type of stone
stoneTypes = {
    "darkage:basalt",
    "darkage:gneiss",
    "darkage:ors",
    "darkage:slate",
    "default:desert_sandstone",
    "default:desert_stone",
    "default:obsidian",
    "default:sandstone",
    "default:silver_sandstone",
    "default:stone",
}

--Iterates over all stone types and registers a block-to-stone recipe per entry

for _, stone in pairs(stoneTypes) do
    minetest.register_craft({
        output = stone
        recipe = {stone.."_block"}
    })
end