Not illustrated

117 • A Collection of Nine Polyhedrons

France, 19th century or earlier
Size: largest, 10 cm
Metal, rock crystal and glass
Not illustrated

Of the five Platonic Solids, the regular Dodecahedron and the Icosahedron do not appear in the structure of crystals. An irregular Dodecahedron structure is found in Pyritohedron minerals, and many viruses have Icosahedral structures. Plato remarked that

God used the Dodecahedron ‘for arranging constellations on the whole heaven’.

Including: Dodecahedrons and Icosahedrons (Platonic), and a Truncated Icosahedron (Archimides).