LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Rutile crystal structure, molecular model. Rutile (titanium dioxide, TiO2) is a common mineral found in metamorphic and igneous rocks. It has a tetragonal structure, with its unit cell (repeating crystal region, outlined in red) being based on a rectangular prism. A titanium ion (blue) is at each vertex of the prism, with another at the prism's centre, and each is surrounded by an octahedron of oxygen ions (silver).
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