iron4dOPEN SOURCE: IRON4D Driver (1050 mA, single-cell, on-diode Mits 300 and 500 driver) As mentioned in my previous thread about the Magic Polarity Correction Circuit (here) IIron is a mineral in 4D Miner. Iron items include Iron Ore, Iron Pick, Iron Axe and Iron Bars. All are grey except for Iron Ore, which is orange.