344 



Spodumene and its Alterations. 



5 Si 



140. 1 





Silica 



45.92 



4 Al 



109.2 





Alumina 



31.40 



2 K 



78.2 



\ equivalent to \ 



Potassa 



14.42 



2 H (basic) 



2. 





Water (basic) 

 . " (aq.) 



2.75 



4 H 



4. 





5.51 







320. j 









653.4 



100. 



Its genetic relationship to Spodumene may be simply repre- 

 sented as follows. In two molecules of Spodumene, 



Li 4 At 2 Si 8 o 24 



the four atoms of lithium have been replaced by (H 2 K 2 ,) three 

 molecules of silica, (3 Si O 2 ) have been removed, and two mole- 

 cules of water of crystallization, (2 H 2 O), have been added by the 

 solution of alteration : leaving that which therefore seems to me 

 the true empirical formula for Killinite, 



H 2 K 2 Al 2 Si 5 0' 8 + 2 aq. 



The following represents these changes graphically, the re- 

 moved constituents being enclosed in brackets, and those added 

 being put in heavy letters. 



H— 

 H— 



o=Si: 



k 



H— O 

 H— O 







=si: 







0_ -Al=-=Si- 



J=°=Si 











_Al=^=Si 



» Al=°==Si 



O i 



>Si< 



>Si< 



\ 



,0— Li 



O— Li 



,0— Li 

 0— Li 



H 

 — K 



— H 

 — K 



