Miller-Bravais indices In the hexagonal and trigonal crystal system, there are four crystallographic axes. M. A. Bravais adapted the Miller notation to express the intercepts of crystal faces on these four axes using the modified symbols h, k, i, l; these symbols are the reciprocals of the ratios of the intercepts on the a1, a2, a3, and c (or x, u, y, and z) axes respectively.
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