There isn't a single mineral that is used to create iron ore. Iron ore is a rock that contains minerals that are rich in iron. The most common minerals found in iron ore are:

* Hematite (Fe₂O₃): This is the most common iron ore mineral, containing about 70% iron.

* Magnetite (Fe₃O₄): This mineral contains about 72% iron and is strongly magnetic.

* Goethite (FeO(OH)): This mineral contains about 63% iron and is often found in weathered iron ores.

* Siderite (FeCO₃): This mineral contains about 48% iron and is less common than the other minerals listed.

So, while these minerals are what make up iron ore, they are not used to *create* it. Iron ore is formed through various geological processes, such as weathering, sedimentation, and volcanic activity.