Iron

Vanilla
See the various pages on the Minecraft Wiki for information on Iron.
 * Iron Ore
 * Iron Ingot
 * Block of Iron

Immersive Engineering
Iron Plates are used to create the Fluid Pipe.

GregTech
Small Iron Ore can be found at a height of 40 to 80 in the Nether Overworld and The End with a relative frequency of 16. Regular Iron Ore can be found sporadically inbetween mix veins at a height of 50 to 120 in the Nether and Overworld with a density of 3, a size of 32, and a relative frequency of 160, and sporadically around Iron mix veins at a height of 10 to 40 in the Nether and Overworld with a density of 4, a size of 24, and a relative frequency of 120.

Iron can also be obtained by breaking down the materials, , , , , , , , , , , , , , , , , , , , , , , , , , and , as well as through ore processing of , , , , , , , , , , , , , , , , , , , , , , , and.

Flaxbeard's Steam Power
Flaxbeard's Steam Power only adds the plate and nugget variations of the Iron material. The Iron Plate can be created by throwing Iron Ingots into a heated Crucible, and then pouring that molten metal into a Mold with a Plate Mold. Six nuggets are used in the creation of a Plate, which makes it unable to be used in other mod's recipes requiring their own Iron Plates.