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This article is about an older version of DF.

Glass is produced at the glass furnace using fuel with either sand (green glass), sand and pearlash (clear glass), or rock crystal and pearlash (crystal glass). A magma glass furnace can also be used, in which case no fuel is required. Raw glass (of all three types) can also be acquired from some trade caravans and be purchased in the embark screen. Note that raw glass can not be made into glass items (excluding strange moods), but can only be cut into gem-like items which can be used for decorating items - you have to buy or collect sand to get the raw materials to make glass.

Glass value corresponds to the difficulty of its production, with green glass having the lowest material value (2), clear glass intermediate (5), and crystal glass the highest (10).


Glass can be used for most things that can be produced at a mason's workshop, (with the exception of slabs, querns and millstones). It can also produce goods normally made at a craftsdwarf's workshop by a stonecrafter, with the exception of obsidian short swords and generic crafts. In addition, it may be made as raw glass, which can then be cut as a gem at a jeweler's workshop by a gem cutter, in a similar fashion to cutting generic stones. These, especially ones made of green glass, are excellent practice for aspiring jewelers (and their production provides experience for glassmakers). Glass can also be made as blocks which can be used to build workshops and constructions. You can even make glass trap components. Unique goods made from glass include glass windows and vials, as well as renamed versions of common furniture.

For more information on the use of glass, see the Glass industry page.

Raw and cut glass storage options can be found under the Gem stockpile sub-menu. Glass blocks are stored in Bar/Block stockpiles.

Glass and magma[edit]

Glass behaves somewhat oddly with magma, despite being strictly magma-safe (with a melting point of 13600 °U ) - glass objects dropped into magma tend to disappear instantly (a property seemingly shared by every organic material), but built glass furniture will survive indefinitely when covered with magma.

Physical properties[edit]

Through memory hacking, the material properties of each type of glass have been determined; for reference, they have been reconstructed below as material definitions:

See also[edit]