250 



Dr Charles Daubeny on the 



Appendix I. 

 Rammelsherg^ s Classification 



Definition of the Classes. 



Symbols 



representing the 



Class. 



Subclasses. 



1st Class. Silica alone 



2d — Silica united with a single Base, 

 having 1 Atom of Oxygen . 



3d — Silica united with a single Base, 

 having 1^ Atoms of Oxygen 



4th — Silica united with several Bases, 

 all with 1 Atom of Oxygen 



5th — Silica united with several Bases, 

 all with 1^ Atoms of Oxygen 



*6th — Silica united with several Bases, 

 both with 1 and Ij Atoms of 

 Oxygen 



7th — Silicates united with Aluminates 



8 th — Silicates united with other salts 



Si 



I SiR 



( 

 1 



I si R I 



IsiR + Si r| 

 Isi Ri-Si RJ 



I Si K + Si K 

 SiR + AlR 



Without M'ater 

 With water 

 Without water 

 With water 

 Without water 

 With water 

 Without water 

 With water 

 Without water 

 With water 

 Without water 

 With water , 

 Without water 

 With water 



With Sulphates 

 With Fluorides 

 With Borates 



* As the minerals comprehended under this class are numerous, the sub- 

 classes are again subdivided according to the proportion which the silica in 

 each of the two binary compounds of which the mineral consists, bears to the 

 bases with which it is united. 



Thus the subclass without water is divided as follows : 

 let Division. Both Silicates neutral — example, Albite. 

 2d — One Silicate neutral ; with one f — example, Spodumene. 

 3d — One Silicate neutral ; with one \ — example, Ryakolite. 



