282 Dr. J. E. Reynolds on certain Mineral Silicates. 



General Classification of the Anhydrous Silicates. 

 Acid or Bisilicates. 



New atomic Old atomic Oxygen 

 weights. weights*. ratio. 



\Si / \ Si/ 



h 2 Yo = hYo 



/ 2 \ / 2 \ 



Class 1. Type of class 

 Class 2. „ 



Class 3. 



\Si/ \Si/ 



H 6 Yo 3 = H 3 X° 3 



/ 6 \ / O fa \ 



1:2. 

 1:2. 



\Si 2 / \SiV 



hA<( 03 == H^O 3 1 : 4. 



All the acid silicates can be well represented on either of the 

 above three types. 



Normal or Unisilicates. 



Si / \ Si / 



Vo 2 = H 2 )x(o 2 



Class 1. Type 

 Class 2. „ 

 Class 3. „ 

 Class 4. _,, 



Class 1. Type 

 Class 2. „ 

 Class 3. 



O 5 

 Si/ 



/o 5 



\Si/ 



H 12 Vo 6 = : H 6 ^< 

 / 6 \ / O c 



\Si 2 / \SiV 



Hi2\<^0 6 = H 6 Yo 6 



/0 12 \ /0»\ 



\siy \Siv 



H 12 Xo 6 = H 6 X° 6 

 /0 1S \ /G 18 \ 



jBasfc Silicates 



\Si/ 

 . . H 16 



O 8 = H 8 XO ! 



Si/ 

 6 \ 



JT18 



\Si/ 



o 9 = i^Vo 9 



1:1. 

 1:1. 

 1 :2, 

 1:3. 



4:3. 

 3:2. 



/ G \ / o e \ 



\Si/ \Si/ 



Hs^O 12 = H 12 Xo 12 2:1. 



/0 6 \ /0 6 \ 



* By contrasting the old and new type-formulae, when constructed on 

 the plan proposed in this paper, it will be seen how very easy the transition 

 from the equivalent to the atomic notation really is. 



