336 



Spodumene and its Alterations. 



replaced by Na 2 , K 2 and H 2 , in various mutual proportions, and 

 1 molecule of aq. aided, with the result : 



Spoduraeue. 



(Li, Na) 6 Al° Si 12 3 



or 



, \ (Li, Na) 2 Si 3 

 6 l JA Si 3 O 9 



Cymatolite. 



H 2 (H, Na, K)°A1 6 Si 12 0" 



3 J(H, Na,K)'SiO') + ■ 



6 I At Si 3 O 9 j ^ aq - 



The latter formula may be represented graphically as follows, 

 and consists, as will be seen, of a closed combination, saturated 

 within itself. 



0- 



)=si: 



■O- 



0- 



o=si: 



0- 



0- 



0=Si. 



0- 



0— H 



, 1= o= Si 



-Al=°=Si- 











AI=°=Si 

 



-Al=°=Si 







*-$-»' 



,Al=°_Si 

 



-°\ 



-°\ 

 .0/ 



:si= 



0— Na 

 0— K 



:si= 



0— H 

 "0—K 



:si= 



0— Na 

 0—K 



0— H 



Microscopical Characteristics. — Under the microscope, the 

 Aglaite of Goshen, instead of being made up of continuous 

 sheets, as it appears to the eye, presents everywhere an irregular 



