PAUL D STEWART / SCIENCE PHOTO LIBRARY PAUL D STEWART / SCIENCE PHOTO LIBRARY
Five manmade platonic solids with three crystals that form such shapes naturally. Lower row from left to right pyrites dodecahedron, pyrites cube, flourite octahedron. In the man made clear glass group from left to right dodecahedron, icosahedron, cube, tetrahedron, octahedron. Platonic solids are polyhedrons whose sides are all the same regular polygon. Platonic solids are named after Plato who saw the shapes as fundamental to the four classical elements of earth, air, fie and water.
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