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Bravais-Miller indices

The Bravais-Miller indices are used in the case of hexagonal lattices. In that case, one uses four axes, a1a2a3c and four Miller indices, (hkil), where hkil are prime integers inversely proportional to the intercepts OPOQOSOR of a plane of the family with the four axes. The indices hki are cyclically permutable and related by h k + i = 0