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40d:Economic stone
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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.
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 |
|---|---|---|---|---|---|
| Calcite | Limestone, Marble | Small clusters | Flux | 2 | " |
| Limestone | Sedimentary Layer | Full Layers | Flux | 2 | ▓ |
| Dolomite | Sedimentary Layer | Full Layers | Flux | 2 | ` |
| Chalk | Sedimentary Layer | Full Layers | Flux | 2 | ░ |
| Marble | Metamorphic Layer | Full Layers | Flux | 2 | ▓ |
| Lignite | All Sedimentary | Veins | 2 Coke | 1 | * |
| Bituminous coal | All Sedimentary | Veins | 3 Coke | 1 | ☼ |