Steiger — Silver Chabazite and Silver Analcite. 31 



Akt. YII. — Preliminary Note on Silver Chabazite and 

 Silver Analcite ; by Geokge Steiger. 



In an investigation upon the constitution of certain silicates 

 an attempt was made to replace the alkaline metals by silver. 

 This has been done with chabazite and analcite, the only two 

 species upon which, so far, I have been able to test the reaction. 



It will at once be seen that this work is analogous to that of 

 Heumann^ and others in the preparation of silver ultramarine. 

 Heumann, by heating blue ultramarine in a sealed tube to 120° 

 for fifteen hours, obtained a silver salt which was very nearly 

 pure, and which upon fusion with various chlorides and iodides 

 yielded corresponding compounds of barium, zinc, manganese, 

 etc., and also compounds of some organic radicals. 



The first experiment which I attempted was to heat ammo- 

 nium chabazitef in a sealed tube with five times its weight of 

 silver nitrate for four hours at 250° C, at which temperature 

 the silver nitrate easily fused. After leaching with water, a 

 determination of silver was made in the dried residue, 25-06 

 per cent Ag20 being found. 



Another portion was boiled for several hours in an open 

 dish with a 10 per cent solution of silver nitrate; the residue 

 from this gave 17*20 per cent Ag^O. These results show that 

 ammonium was at least in part replaced by silver. The 

 experiments upon chabazite were only preliminary, and are 

 to be carried farther. 



More complete work was done in the case of analcite, and 

 three portions of it were treated as folio u^s : 



"A." Natural analcite heated in an open tube with dry 

 silver nitrate for four hours to 1:00° C. 



" B." ISTatural analcite heated in a sealed tube with dry 

 silver nitrate for four hours at 250°C. 



" C." Ammonium analcite,:}: heated in a sealed tube with 

 dry silver nitrate four hours at 250° C. 



All were leached with water, and washed until the filtrates 

 gave no test for silver ; the residue was then dried on the 

 water bath. The product in each case was a white powder not 

 differing in appearance from the original material. 



The analyses of the different portions are given below, 

 together with the composition of the theoretical compound 

 Ag,0-Al,03-4SiO,-2H,0, which is found in column " D." 



* Liebig's Annalen, cxcix, 253 (1879). 



\ This Journal, vol. xiii, p. 27. % This Journal, vol. ix, p. 117. 



