STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Calcareous phytoplankton. Coloured scanning electron micrograph (SEM) of the external mineralised structure (coccosphere) of a small marine algal organism (phytoplankton) called a coccolithophore. Coccospheres are made up of coccoliths, which are individual plates of calcite crystals. Magnification: x3000 when printed 10 centimetres wide.
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