ARNOLD FISHER / SCIENCE PHOTO LIBRARY ARNOLD FISHER / SCIENCE PHOTO LIBRARY
Sample of goethite. Goethite is a form of iron hydroxide (alpha-FeOOH). It can occur as prismatic crystals or, more usually, in tabular or stalactitic aggregates. It is an important constituent of 'limonite', rocks formed under oxidising conditions at the expense of iron- bearing minerals. The form seen here shows radiating ball-like aggregates. Goethite is an important iron ore. This sample was found in Cornwall.
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