LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Calcium carbonate. Molecular model of the ionic mineral calcium carbonate (CaCO3). This chemical forms the main component of the shells of marine organisms and egg shells, and is an abundant mineral deposit that formed under ancient seas. Atoms and ions are represented as spheres and are colour-coded: calcium (green), carbon (grey) and oxygen (red). The calcium ion and the carbonate ion have a double positive and negative charge respectively.
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