Rhombic dodecahedron
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In geometry, the rhombic dodecahedron is a convex polyhedron with 12 congruent rhombic faces. It has 24 edges, and 14 vertices of 2 types. As a Catalan solid, it is the dual polyhedron of the cuboctah
A garnet crystal
Modell, Kristallform Deltoiddodekaeders Krantz
Garnet
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Garnets are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives.
Rhombic dodecahedron
…some stellations of the rhombic dodecahedron, one of which is the Escher's solid. The rhombic dodecahedron may also appear in nature (such as in the garnet crystal), the architectural philosophies, practical usages, and toys. The rhombic dodecahedron is a polyhedron with twelve rhombi, each of which long…
Garnet Andradite 20
A sample showing the deep red color garnet can exhibit.
Crystal structure of pyrope garnet: White spheres are oxygen; black is silicon; blue is aluminium; and red is magnesium.
Same view, with ion sizes reduced to better show all ions