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40d:Flux
Stones which are classified as flux materials can be used in the creation of pig iron and steel at a smelter. They are considered economic stones. Unlike common rock they all have a material value of 2 instead of 1. Blocks made out of flux materials cannot be used in the production of pig iron or steel.
The following materials fit in this reaction class:
Flux is usually found in abundance if present and thus is a preferable building and crafting material over any other stone that has a material value of only 1; rooms, crafts and furniture made from it will therefore have twice the value.
Most flux-types form sedimentary layers (limestone, dolomite and chalk) or are present as inclusions in them (calcite) and thus are seen in the embark-screen. Marble is a metamorphic layer so it can be found from almost any biome. It can be found near igneous extrusive layers i.e. near volcanoes and magma vents.
Trading for flux
If your map has no flux on it (which is a common situation), then you can request it from the dwarven traders (assuming the traders have access to flux). Make sure you order (flux material) stone, which is in the material section, since you can't use flux blocks.