In a recent paper on the crystallography of axinite (1937 A) a unique setting was proposed for triclinic crystals and named the normal setting, since it was founded on principles and conventions which are now widely accepted. The normal setting was defined as the setting in which the geometrical elements refer to the cell given by the three shortest non-coplanar identity periods of the structural lattice, in the one orientation in which the axis c[001] is the axis of the main zone, the plane c(001) slopes to the front-right, and the axis b[010] is greater than the axis a[100].

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