ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY
Limonite. Specimen of rust-coloured "limonite" rock. It is a secondary mineral found in surface oxidation zones of iron deposits, or a residual mineral left after the break down of carbonate and silicate rocks (laterite) under tropical or subtropical conditions. Limonite is not much used in modern iron and steel works as it often contains impurities of phosphorus.
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