A method for calculating the simplest face symbol with a given accuracy

Abstract

Let's imagine a crystal being measured on a universal, theodolite goniometer. Let's assume we have to measure a face that has various defects in formation and produces not one but several signals (due to the development of vicinal forms). Under such conditions, the measurement accuracy is significantly reduced and rather large errors can be made in the readings of the angles φ (along the vertical limb of the goniometer) and ρ (along the horizontal limb). Even if a face is formed reasonably well , one can often still vouch for an accuracy of only a few minutes, and higher accuracy is achieved only in exceptional cases.

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