where is iron most abundant?
Pure iron is a soft, silvery metal often covered by a thin layer of reddish dust. It is highly abundant in our environment from core to crust. It is rare to find pure iron in nature, and it is most common to find the metal bound to other elements such as oxygen. Elemental iron is highly chemically reactive. In warm, moist air, iron will quickly oxidize to form rust or iron oxide. The presence of rust makes it easy to identify iron in geological formations, from the red clays of the southern United States, to the iron-rich rocks of Mars which are red to the naked eye from millions of miles away.
I am assuming you mean on our planet. It is most abundant at the core of out earth. In the universe in general, it is most abundant at the center of stars, where the heat and pressure are high enough to fuse iron.