Explanation of the Principles of Crystallography And Crystallophysics
Explanation of the Principles of Crystallography And Crystallophysics
Thomas Egleston
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2 Digitized by VjOOQIC 18 PRINCIPLES OF CRYSTALIiOGEAPHT.
Let tbe zones to be determined be — bman; bdce; afc; apd; bpfq; cspm; dsfn; cqn; aqe The existence of these will be seen principally from the parallelism o< the respective edges. Where there is no real edge, as is the case in the angle a g, the hypothetical zone«axis can be found by turning the crystal round. All faces which, in turning round the same axis, reflect the light are tautozonal.
In order to determine the combination, it is first necessary to select a system of axes. Regard will be had to the real or apparent symmetry of the crystal, in this way, that when a system less symmetrical in com- pleteness and inclination of the faces ^approaches one of higher sym- metry, this analogy is retained.
We select three faces, abCj for the planes of the axes 5 their lines of section give the crystallographic axes. We project these in such a way that the zone a 6 is contained in the principal circle.
The exactitude of the relation of the angles makes naturally no dif- ference, if it is only a question of the solution of the combination.
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