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Magma glass furnace

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Magma glass furnace

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Magma glass furnace.png

Glass furnace icon.png

Job Requirement


Materials Labors
Materials Used
Goods Created
This article is about the current version of DF.
Note that some content may still need to be updated.

A magma glass furnace is a specialized form of furnace designed for use in the glass industry. It is functionally identical to a glass furnace, but operates through use of magma instead of fuel


Dwarves with the glassmaking labor enabled can use a magma glass furnace to produce a wide array of objects. Almost all furniture can be made here (beds, millstones, querns, and slabs are the exceptions), as can blocks, trade goods, gems (in the form of raw glass), and a few items which can only be made of glass:

  • Vials - These are necessary for acquiring certain extracts at a farmer's workshop, and can also be used in place of flasks or waterskins.
  • Windows - These function much like gem windows, but are also necessary inputs in the production of display cases.
  • Instruments - Depending on the specific outcome of your particular world gen, you may be able to produce unique instruments and instrument pieces here. Produced glass instruments will always be made of green glass, but caravans may bring clear and crystal glass instruments for trade.

Some glass items are functionally identical to items of different materials, but have different names. A glass door is called a "portal," a glass coffer is called a "box," a glass pipe section is called a "tube," and a glass cage is called a "terrarium" or "aquarium."

Magma glass furnaces can also be used to issue the "Collect Sand" order. Doing so requires an empty bag, an Item Hauler, and a zone designated for sand collection. As the "Collect Sand" order will prevent other furnace tasks from being started until the sand is collected, it is often wise to build several additional furnaces, magma or otherwise, to use for the collection of sand. Not all maps will have a source of sand, but sand may be imported in small quantities. Caravans can also bring raw glass gems for trade, which can be particularly useful for dealing with strange moods.

Passing dwarves may admire magma glass furnaces and receive a good thought.


Producing glass items requires working with raw materials, though the specific materials are determined by the kind of glass you wish to produce. Green glass goods are simple, requiring only a single bag of sand - the color of the sand makes no difference to the finished product. Clear glass goods are more complicated, requiring a bar of pearlash in addition to the sand. Crystal glass replaces the sand with an uncut rock crystal gem, while still requiring the bar of pearlash. Rock crystal is not present in most regions, and is very limited on those maps it does generate on, making production of crystal glass goods a rarity.

Unlike traditional glass furnaces, reactions at a magma glass furnace do not consume fuel, but do require the presence of magma. This magma is not consumed during production of glass goods; a single tile of magma will last forever.


Magma glass furnaces only become available for construction after discovering a source of magma on your map, and can only function when one of its eight border tiles is above a channel filled with at least 4/7 height of magma. If this supply of magma becomes unavailable, the magma glass furnace will immediately become inoperable, even for such unfueled tasks as collecting sand. Note that you can still easily collect sand with a non-magma glass furnace.

The overall value of the furnace building helps determine the strength of the good thought that your dwarves receive when admiring it. This value is determined by the value of the material used in its construction as well as the quality of the builder's efforts.

Workshops Ui b.pngbUi bo.pngo
Clothing and Leather Ui b.pngbUi bo.pngoUi bol.pngl
Clothier · Dyer · Leather · Loom
Farming Ui b.pngbUi bo.pngoUi bof.pngf
Furnaces Ui b.pngbUi bo.pngoUi bou.pngu