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The 4 sizes of spheres in the ICE Solid State Model kit, whose radii reflect ideal packing ratios in many mineral structures. If the clear spheres at the left (1 inch diameter) are packed in the shape of a cube, the green sphere (0.732 inch diameter) fits snugly in the cube's center; if the clear spheres are packed in the shape of an octahedron, the blue sphere (0.414 inch diameter) fits snugly in the octahedron's center; and if the clear spheres are packed in the shape of a tetrahedron, the pink sphere (0.225 inch diameter) fits snugly in the tetrahedron's center. (Companion Figure 5.10)
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