To smelt any ore, equip it and activate the [[furnace]] while there is [[Coal]] in your inventory. One unit of Coal is required for each smelting operation, regardless of the material or duration.
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To smelt [[Quartz]], equip it and activate the [[furnace]] while there is [[Coal]] in your inventory, the same as ore. One unit of Coal is required for each smelting operation, regardless of the material or duration.