Limonite

From DwarfFortressWiki

Limonite

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Uses
Ore of iron Masonry Stone crafting Construction
Location
Sedimentary layers Found as veins
Properties
Economic stone Material value 8
Wikipedia article

Limonite ore can be smelted at a smelter by a dwarf with the furnace operating labor activated to produce iron bars. It is, for all metalsmithing purposes, identical to magnetite and hematite.