Relative birefringence constants of biaxial crystalline substances
Abstract
The points constructed according to the methods just described are distributed on the proposed diagram, as can be seen immediately, in a certain orderly manner along an arc, making it possible to predict the optical properties of as yet undiscovered biaxial minerals: it is highly probable that for such minerals, their relative birefringence determinants will give points on the diagram distributed between the already known points on the same arc of our diagram. Consequently, the reverse is also true: taking any point between those already known on this arc, we can expect that it corresponds to a mineral that is not yet known, and based on the determinants found, we can calculate the angle of the optical axes using the known formulas that were given at the beginning of this article.
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References
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