Mitochondrial iron transporter that mediates iron uptake. Probably required for heme synthesis of hemoproteins and Fe-S cluster assembly in non-erythroid cells. The iron delivered into the mitochondria, presumably as Fe(2+), is then probably delivered to ferrochelatase to catalyze Fe(2+) incorporation into protoprophyrin IX to make heme (Probable). Ubiquitous. Expressed at low levels throughout the whole embryo at 24 hpf. Belongs to the mitochondrial carrier (TC 2.A.29) family.