Enables iron ion binding activity. Acts upstream of or within iron ion transport. Located in mitochondrion. Is expressed in several structures, including alimentary system; cardiovascular system; genitourinary system; nervous system; and sensory organ. Human ortholog(s) of this gene implicated in hemochromatosis type 5. Orthologous to human FTH1 (ferritin heavy chain 1). [provided by Alliance of Genome Resources, Apr 2022]