BEN JOHNSON / SCIENCE PHOTO LIBRARY BEN JOHNSON / SCIENCE PHOTO LIBRARY
Lumps of iron ore. The ore seen here is the earthy, granular form of hematite - iron(III) oxide. This is the most important ore of iron, and is widespread. It is a common accessory mineral to igneous rocks, especially lavas, but is also found in sedimentary formations. This granular form when crushed is used as a polishing powder and as a pigment (red ochre).
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