BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Haematite. This is kidney ore, the botryoidal (grape-like) form of this mineral ore (iron oxide, formula: Fe2O3) that is mined as the principal source of the metallic element iron. The sample has been polished to remove the red iron oxide (rust) that forms upon exposure to air. Forms of haematite can vary in colour from black-grey to red. It is a common mineral, used in paint making (as a red pigment) and in polishing compounds.
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