430 M. Berxelius on Isomorphism as [June, 



Chromated lead , Pb Chr 



Vauquelinite 2 PW Chr^ + Cu3 Cht» 



Boracic add. 



Hydrated boracic acid Eo Aq^ 



Borates. 



Tineal Na Bo- + 20 Aq 



Boracite M Bo 



Borosilicaies. 



Datholite Ca Bo^ + Ca Si' + Aq 



Botryolite Ca Bo + Ca Si' + Aq 



Tourmaline. 



a. •^—— with base of potassa. 



I. lithia. 



c. — — ^— magnesia. 



Axinite. 



Carbonic acid .•..•> C 



Carbonates. 



Carbonate of soda Na C* 



Witherite Ba C^ 



Strontianite Sr C 



Carbonate of lime < Ca C* 



a, Arragonite. 

 h. Calcareous spar. 

 Carbonate of magnesia. 



a. Hard } .. .. 



b. Earthy igiobertile) J M C 



c. With water of crystallization .... M C + 6 Aq 



d. WTiite magnesia M Aq'* + 3 M C^ 



e. Dolomite Ca C^ + M C^' 



/. Miemite. 



g. Gurhofianite. 



Ca 

 Carbonate of manganese ("C- 



Mn. 



}' 



Carbonate of iron Fe C- 



Mixtures of the preceding. 

 Carbonate of zinc. 



a. Calamine .,,,.,,.,. ZnC 



