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Diatoms. The cell walls of diatoms are made of silica formed into their characteristic pillbox shape. Diatoms are composed of two valves or frustules, one on top of the other, within which the living matter of the diatom is found.
Diatoms are the most common type of phytoplankton. They are single-celled yellow algae whose cell walls contain a lot of silica, glass-like substance. The actual diatom fits inside this cell wall, with one half of the wall fitting over the second half, like a lid. The name diatom actually means cut in two in Greek.