Nautilus shell fragment, SEM

Nautilus shell fragment, SEM

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Caption: Nautilus shell fragment. Coloured scanning electron micrograph (SEM) of a fragment from a nautilus shell. The centre of the shell is at upper left. Parts of the shell chambers and their dividing walls are at right. The interior shell layer in a nautilus consists of a composite material called nacre (also known as mother-of-pearl). This material is mostly a form of aragonite, a calcium carbonate mineral. Nacre has a very high tensile strength due to a combination of soft organic layers and hard inorganic platelets of aragonite. The nautilus is a marine mollusc related to the octopus and squid (all are examples of cephalopods). It has a spiral shell divided into many chambers, of which the animal inhabits only the outermost. Magnification: x33 when printed at 10 centimetres across.

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Keywords: aragonite, biological, biology, broken, calcium carbonate, colored, coloured, composite material, false-colored, false-coloured, fauna, fragment, inorganic, marine, marine biology, material, materials science, mineral, mother-of-pearl, nacre, nature, nautilus, no-one, nobody, organic, scanning electron micrograph, scanning electron microscope, sem, shell, zoological, zoology

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