If the twinned icosahedra were independent without twinning then B23 would be a bridge site linking three icosahedra.
12.
Both the Y atoms and B 12 icosahedra form zigzags along the " x "-axis.
13.
Figure 19a shows the network of boron icosahedra in the boron framework of ScB 19 + x Si y.
14.
These icosahedra arrange in a thirteen-icosahedron unit ( B 12 ) 12 B 12 which is called supericosahedron.
15.
He was also known for startling the travelling public by carrying around a large string bag filled with garishly coloured stellated icosahedra.
16.
Those atoms are another boron atom in the counter bridge site and three equatorial boron atoms of one of three B 12 icosahedra.
17.
Two layers, respectively constructed by the icosahedra I1 and I2, alternatively stack along the " c "-axis.
18.
Some metallic dodecaborides contain boron icosahedra, others ( for example yttrium, zirconium and uranium ) have the boron atoms arranged in cuboctahedra.
19.
Each removed vertex creates a pentagonal prism cell, and diminishes two neighboring icosahedra into pentagonal antiprisms, and each octahedron into a square pyramid.
20.
Figure 13 depicts the " c "-plane network revealing the alternate bridging of the boron icosahedra by N and C atoms.
