ELECTRON MICKOSCOPY 



Fig. 12b 



Fig. 12. Synthetic halite (NaCl). A, Chromium-shadowed formvar replica of a crystal face etched with 

 water. X15,300. B, the same after etching with ethyl alcohol. X36,500. (Courtesy of A. Oberlin, Labora- 

 toire de Mineralogie, Faculte des Sciences, Paris) 





Fig. 13. MuUite crytals grown from a kaolinite 

 surface at 1320°C. The hexagonal arrangement re- 

 sults from the structure of the parent material. 

 X 14,000. 



196 



