Several experiments on crystals cut in the shape of spheres

Abstract

In brief reports of the 1st issue of volume I of the Mining Institute Notes” (p. 83), I reported on some experiments in the growth of spheres (hemispheres) prepared from crystals of chrome and potassium alum. Similar experiments were carried out with rock salt (NaCl) crystals from Stassfurt. A welded piece of such salt was turned into a hemisphere with a diameter of 10 m.m. with a central plane (100) and glued with wax onto a glass hemisphere of the same diameter.