STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Calcareous phytoplankton. Coloured scanning electron micrograph (SEM) of the external mineralised structures (coccospheres) of small marine algal organisms called coccolithophores. The coccospheres are made up of coccoliths, which are individual plates of calcite crystals.
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