The rules for the conventional orientation of a triclinic crystal (Donnay and Mélon, 1933; Donnay, Tunell, and Barth, 1934; Donnay, 1943) are the following. The axes must be: (1) chosen along the shortest three translations; (2) named so as to satisfy the condition c < a < b; (3) oriented so that the axial cross is right-handed, with α and β both obtuse.

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