The points on the proposed diagram (see article) constructed from the examples just presented are distributed, as at least directly visible, in some harmonious order, along an arc, and it becomes possible to predict from it the relationships between the properties of yet undiscovered biaxial minerals; it is very likely that for such minerals, the relative determinants of their birefringence will be given when plotting on a diagram by points distributed between already known points on the same arc of our diagram. Consequently, and vice versa: taking any point along with those already known on this arc, we can expect that it corresponds to an as yet unknown mineral, and from the found determinants we can calculate the value of the angle of the optical axes based on the known formulas that were given at the beginning of this articles.
The structure of such parts of the earth’s crust as the modern Ural Ridge is something so complex that no human imagination is able to comprehend it in all details, and any attempt in this direction comes down to a more or less detailed diagram. But especially grandiose mining areas hid within themselves not only this complexity of structure, but also so many subsequent changes and transformations that even a schematic representation of the processes taking place there encounters barely surmountable difficulties. It is enough to point out the intense activity of metamorphosis and weathering to note these features. See the results of the study in the article.
