58 
THE GEOLOGIST. 
Simple Silicates of 
Alumina \. Andalmlte or CMastoUte. 
2. Kyanite. 
3. Kaolin. Hydrated. 
Lime 4. Wulktstonile. 
T). Datol 'de and ApophylUie. Zeolites. 
Magnesia .6. Talc. Generally some Fe. 
7. Steatite. ditto. 
8. Serpentine. Hydrated. Alg often largely 
replaced by Fe. 
Compound Silicate.? of 
Alumina and Lime 
Alumina and Magnesia 
Alumina and Potash . 
Alumina and Soda .... 
Alumina and Lithia . . . 
Alumina and Per-oxide Iron 
Alumina, Lime, and Soda. . 
Alumina, Soda, and Potash . 
Alumina, Lime, and Iron . . 
Alumina, Lime, Magnesia, 
AND Iron 
Alumina, Magnesia, & Iron , 
9. Wernevite, or Scapolite. Part of Ca gene- 
rally replaced by Na, K. 
10. Anorthite. Felspar species ; part of Ca 
generally rei)laced l>y Mg, K, Na. 
11. Stilbite ox Desmine, Heulandite, Leonhardite, 
Scolezite or calcareous Mesotype, Chaba- 
site (often with Na), Laumonite, Prehnite 
(often with Fe). All zeolites. 
12. Soajistone. Hydrated ; generally with Fe. 
13. Orthoclase. Common, or Potash Felspar. 
14. Leucite. A Felspar species. 
15. Hartnotome or Baryta-Harmotome, with 
silicate of Ba. A zeolite. 
16. Alb it e. Soda Felspar, a small portion of 
Na usually replaced by Ca, K. 
17. Sodalite. Combined with Na CI (Chloride 
of Sodium). 
18. Mesofypeor Nairolite,a,nd Analcime. Zeolites. 
19. Petalite. Lithia Felspar ; often contains 
Na. 
20. Spodumene, or Triphane. A Felspar species ; 
often with Na. 
21. Staurolite. 
22. Bole. Hydrated ; allied to Kaolin, and the 
bases of clays. 
23. Oligoclase. A Felspar species. 
24. Labradorite. ditto. 
25. Andesine. ditto. 
26. Epistilbite, Mesolite, Thomsonitc, and Comp- 
tonitc. Zeolites. 
27. Sanidine or Adularia. Glassy Felspar. 
28. Ryacolite. A Felspar species. 
29. Ncpheline. ditto. 
30. Epidotc. 
31. Oarnet. The mineral is very variable in its 
composition, and has many varieties. The 
proportions of Al, Ca, and the two oxides 
of iron vary greatly. It often contains 
Mn. 
32. Idocrase or Yesuvian. 
33. Cordierite. 
