When the finished crucible is placed in the input slot of the fire pit, the crucible GUI opens. Ore nuggets to smelt can be placed into these four input slots. When the crucible is heated using fuel with a temperature above the ore melting point, the ores liquefy within the crucible. When the crucible moves to the fire pit output slot, the crucible can be removed and the metal poured into an empty ingot mold, tool mold, or anvil mold.
- Please note: the crucible is a container but is not a storage vessel. If a player removes the crucible from the fire pit before heating, any ore nuggets inside the crucible will fall out of the container.
Crucibles can be placed and picked up from a solid block as any pottery item. Crucibles may be carried in player inventory, stored on shelves, or in containers. Some players store a crucible in the input slot of the fire pit.