Chemical Composition of Amp/dbole. 



45 



Analysis IX, 



Cornwall 



N. Y.- 



-HUDSONITE. 







rAi- 



-(F,OH)l ' 





r A i^°- Nan 



// 





Ratios | 



>() 



Residue 





Residti 



LA1- 



-(F,OH)J 









"Si,Ti]0„ -627 



—•076 



•551 



—•089 



•462 



\Al,Fe]„O s -165 



—•076 



•089 



—•089 







'Fe,Mn,Mg]0 -376 







•376 



—•089 



•287 



CaO -189 







•189 ) 

 •065 j" 



—•089 



•165 



[K,Na]„0 -065 









H„0 ' -072 ) 



f; -oo7 f 



— 076 



•003 





•003 









Total RO = 



= •455 



Proportion of radicals and remaining bases : 









Eatios 



Per cents 





[Al„0(F,OH) 



!".o 



•076 



12-2 





[Al 2 4 KNa,]' 







•089 



14-3 





[Fe,Mn,Mg]0 





•287 



46-3 





CaO 





•165 



26-6 





H 2 





•003 



•5 







•620 



100-0 



The interpretation of this analysis is essentially like that of 

 the previous one. 



Analysis X, Mte. Somma. — In this analysis the amount of 

 water is small and only a trace of fluorine is present, conse- 

 quently in order to establish a 1 : 1 ratio between Si0 2 and RO 

 it seems necessary to assume, in addition to the radicals pre- 

 viously suggested, a third one of the following type : 



Al— CK 

 >0 R". 



Al— O^ 



The interpretation is then as follows :- 



