Iron Ore
From Space Engineers Wiki
Iron Ore is one of raw ores available from mining asteroids. It can be processed in a Refinery or an Arc Furnace to produce Iron Ingots.
It has a distinctive "rusty brown" appearance, similar in appearance to Nickel Ore. It can be distinguished by looking at its shade and its impurities; it is a darker shade of brown than Nickel and has some blemishes.