As is known from the elementary course of crystallography, to determine the symbol [r0, r1, r2, r3] of the belt axis of a hexagonal-isotropic complex from the symbols of two non-parallel faces (p0, p1, p2, p3) and (q0, q1, q2, q3) belonging to this belt, you can use the following technique (see article).
Артемьев Д.Н. Соотношения между символами граней и ребер в кристаллах гипогексагонального типа // Записки Горного института. 1914. Т. № 2-3 5. С. 234-236.
Artem’ev D.N. Relationships between face and edge symbols in hypohexagonal crystals // Journal of Mining Institute. 1914. Vol. № 2-3 5. p. 234-236.
