﻿Fig. 
  7. 
  

  

  Fig. 
  8. 
  

  

  xl30 
  

  

  190 
  

  

  Fig. 
  9. 
  

  

  Fig. 
  10. 
  

  

  x!23 
  

  

  xl90 
  

  

  Fig. 
  11. 
  

  

  Fig. 
  12. 
  

  

  xl23 
  

  

  xl90 
  

  

  Fig. 
  7, 
  1010 
  etched 
  by 
  1 
  : 
  1 
  sodium-potassium 
  fusion; 
  Fig. 
  8, 
  1010, 
  imma- 
  

   ture 
  figures 
  of 
  Fig. 
  7; 
  Fig. 
  9, 
  1010, 
  natural 
  etchings; 
  Fig. 
  10, 
  same 
  highly 
  

   magnified; 
  Fig. 
  11, 
  0001, 
  natural 
  etchings; 
  Fig. 
  12,0001, 
  dihexagonal 
  etching. 
  

  

  