32 Steiger — Silver Chabazite and Silver Aiialcite. 



A. B. C. D. 

 Leach Avater 



Na^O (calc. to arialcite) - . 13 'IS 12-57 -60 

 Dried residue 



SiO^ 41-31 40-08 



Al.Og 16-44 16-29 



Ag,0 ._. 37-45 36-91 



* Na,0 -85 -81 



H^O 4-29 5-86 



KH3 .-.. 



Nitrates none none 



42-69 



39-35 



18-22 



16^72 



32-01 



38-03 



•68 







6-08 



5^90 



•69 





none 







100-34 99-95 100*37 100-00 



It seems from the foregoing experiments that at least some 

 of the natural silicates, which have been supposed to be very 

 refractory bodies, are easily attacked and replacements effected 

 by simple operations. 



Work is now in progress on other minerals, along these same 

 lines, and it is also proposed to study the action upon them of 

 thallium and lead nitrates and other salts. 



Chemical Laboratory, United States Geological Survey, 

 Washington, D. C. 



