ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Diamond. Molecular model of diamond, a form (allotrope) of the element carbon (C). Carbon atoms are shown as spheres (black) linked by covalent bonds (grey). Each carbon atom is positioned at the centre of a tetrahedron, linked to four others at the corners. This repeating rigid structure does not allow rotation about the bonds, making diamond the hardest known naturally- occurring material. Diamond is used as a precious gemstone and in industry to tip heavy-duty cutting and drilling equipment.
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