On the influence of impurities during crystallization between spheres

Abstract

Using the hemispheres of potassium alum I had and the corresponding cavities in a large crystal, I wished to test how impurities in the solution, which do not exert a decomposing effect on the solute, influence the process. A likely conclusion is the formation of faces, although of poor quality, with more complex symbols on the spherical surfaces, but of such small size that reflections are generally undetectable, and only some of them begin to become detectable due to impurities that improve crystallization.

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