NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Petrified wood. Specimen of a fossilised piece of wood that has been preserved by petrification. Mineral quartz (silica, a form of silicon dioxide) has replaced the structures of living wood, a process that 'petrifies' the tree (turns it to stone).
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