Breakfast cereal is an excellent source of iridium
If you don't have any science in your background and you decided to wing it, "Ir" would appear to be the right symbol for "iron ore".
In the forum user mer-mer-mer-mer-mer notes that iridium, a transition metal of the platinum family, is not something you would want to ingest:
"Chemist here! The real worst part of this is that Iridium is the 2nd densest element and most corrosion resistant metal, even at temperatures as high as 3600 °F. Good luck passing that lump."