48 



Molecular ratios 

 CO., 23,47 0,538 \ 



ThO^ 0,30 • 0,001 / 



2 



.... 9Я.72 075» 1 



0,150 0,84 



Ce^O.^ 23,72 0,072 \ 



La^O^DioO.^ etc. . 25,67 0,078/ 



Y^O.^ trace 



FeO 1 ,43 0,020 I 



BaO 17,30 0,113 > 0,167 0,94 



CaO 1,91 0,034 J 



//o 0,80 0,044 \ 



T. , ^ /Л r 0,172 0,97 



t\ (4,87) 0,128 J ' 



Insoluble . 2,58 



102,05 



2,05^ 



Too 



The molecular ratios of the carbon dioxide, the sesqui- 

 oxides , the monoxides, and the fluorine are consequently ap- 

 proximately 3:1:1:1. This gives the following chemical for- 

 mula for Gordylite : 



Ce,^F.,BaC.^O,. 



But the values found do not exactly correspond to this 

 formula. The discrepancy might be explained by the material 

 being perhaps in part not quite fresh. That the material 

 for the analysis was not perfectly free from foreign admix- 

 tures , is shown by the insoluble residue. It is also to be 

 regretted that the fluorine could not, for want of material, be 

 determined directly. 



However, it is evident that the mineral in question is nearly 

 related to parisite , especially to the parisite from Muso. In 

 chemical constitution the two minerals agree excepting that the 

 amount of calcium entering into one is replaced by barium in 

 the other. The specific gravity of cordylite, too, is the 

 same as that of the parisite from Muso ; basal cleavage is 

 likewise common to the two minerals. On the other hand, 

 they difl'er distinctly from each other in cordylite being 



