Economic stone
From Dwarf Fortress Wiki
Economic stones have special uses as ore, fuel or flux, or other uses like making special items. You can use the z : Stone menu to restrict or un-restrict their use in items and buildings. In technical terms, an economic stone is any stone which can be used as a reagent in any form of reaction. Obsidian is an exception, having been made an economic stone even though it is not used in any reaction - its specialty is that it can be used to craft swords.
The Stone menu will also show what each stone can be used for--very useful for figuring out what you need to mine to make that obscure metal your noble is whining about.
| Stone name | Found in | Found how | Use | Value | Icons |
|---|---|---|---|---|---|
| Obsidian | Igneous extrusive | Full Layers | Swords | 3 | ▓
|
| Calcite | Limestone, Marble | Small clusters | Flux | 2 | "
|
| Chalk | Sedimentary Layer | Full Layers | Flux | 2 | ░
|
| Dolomite | Sedimentary Layer | Full Layers | Flux | 2 | `
|
| Limestone | Sedimentary Layer | Full Layers | Flux | 2 | ▓
|
| Marble | Metamorphic Layer | Full Layers | Flux | 2 | ▓
|
| Bituminous coal | All Sedimentary | Veins | 3 Coke | 1 | ☼
|
| Lignite | All Sedimentary | Veins | 2 Coke | 1 | *
|
