conchiolin

navigate by keyword : annual around axis calcium called carbonate circles closely columella conchiolin connected crystals each edge from gradually grows growth helix immersed its itself layers like made mainly mantle maximum other outer protein reaches sheets shell size snail start stops substance that three when wraps

The shell, made up mainly of crystals and sheets of calcium carbonate Royalty Free Stock Photo

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Detailed anatomical illustration of a cockle shell, highlighting its internal structures and external features Royalty Free Stock Photo

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The shell, made up mainly of crystals and sheets of calcium carbonate

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Shell among stones Royalty Free Stock Photo

Natural composition with a shell Royalty Free Stock Photo

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Pale yellow shell on black background Royalty Free Stock Photo

The shell, made up mainly of crystals and sheets of calcium carbonate closely connected to each other and immersed in a protein substance (conchiolin), is made up of three layers. The shell grows in annual circles that start from the outer edge of the mantle, and gradually wraps itself like a helix around an axis called the columella. When the snail reaches its maximum size, growth stops.