Haematite

Haematite

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Haematite, close-up. This common mineral is a variety of iron oxide (Fe2O3), mined as one of the main ores of iron. The specimen shown here has a bulbous appearance, also referred to as botryoidal (grapelike), which in mining practice is referred to as kidney ore. Here it is a dull red, known as red ochre, although haematite's colour can vary from black to red to steel grey. As well as being mined for iron, it is used industrially as a red pigment in paint, and in polishing compounds. Actual width: 18 centimetres.

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Keywords: botryoidal, bulbous, chemical, chemistry, close-up, common, detail, earth science, fe2o3, geological, geology, grape-like, grapelike, haematite, hematite, iron, iron ore, iron oxide, kidney ore, mined product, mineral, mineralogy, ore, pigment, red, red ochre, rock, variety

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