Close-packing of Equal Spheres - Miller Indices

Miller Indices

Crystallographic features of hcp systems, such as vectors and atomic plane families can be described using a four-value Miller index notation ( hkil ) in which the third index i denotes a convenient but degenerate component which is equal to −hk. The h, i and k index directions are separated by 120°, and are thus not orthogonal; the l component is mutually perpendicular to the h, i and k index directions.

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