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PACKING OF SPHERES<br />
(3 of 4) Hexagonal closest<br />
Noncubic unit cell<br />
Two alternating layers, a-b-a-b, offset from each other so that the spheres in 1 layer sit in the small triangular depressions of neighboring layers. Each sphere is touched by 12 neighbors, 6 in same layer, 3 above & 3 below.

Fphoto-37329407C-2RM.jpg

PACKING OF SPHERES
(3 of 4) Hexagonal closest
Noncubic unit cell
Two alternating layers, a-b-a-b, offset from each other so that the spheres in 1 layer sit in the small triangular depressions of neighboring layers. Each sphere is touched by 12 neighbors, 6 in same layer, 3 above & 3 below.

Copyright:© 1994 Richard Megna - Fundamental Photographs

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Richard Megna