ILLUSTRATIONS 
Pag^ 
Fig. 1. Natrojarosite ', 
2. Plumbojarosite 
3. Dioptase 
4. Libethenite 
5. Lawsonite 
6. Dumortierite altering to muscovite II 
7. Forms of dumortierite 11 
8. Dumortierite 1 
9. Tellurite li 
10. Anhydrite 1 
11. Glaucodot ] 
12. Libethenite 
4 
