The mine in Kiruna, Sweden, is the world's largest underground iron-ore mine. After the mining tour of LKAB's Visitor Centre, iron ore pellets are given to the participants. An iron ore pellet is a small ball consisting of a mix of upgraded iron ore, oxides and additives.
Here are BLACK iron ore pellets, but the plastic bag container is BROWN, proving that iron oxide (Fe2O3) is present.
Here are shape variations of such iron ore pellets.
