546 



no"\v cRors peed. 



acted evidently in two or tliree days. Chloride of barium 

 and nitrate of cadtnium were slower in their effect. Chlo- 

 rides of zinc and strontium at first, appeared not to react ; 

 but after twelve days, lime was found in the solution. 

 Chloride of magnesium was still tardier in replacing lime. 

 Four grams of powdered chabazite were digested with 

 4 grams of chloride of sodium and 400 cubic centimeters 

 of water for 10 days. The composition of the original 

 mineral (i,) and of the same after the action of chloride of 

 sodium (ii,) were as follows : 



Total, 99.75 • 100.37 



Nearly one-half the lime of the original minei'al was 

 thus substituted by soda. A loss of water also occurred. 

 The sokition separated from the mineral, contained nothing 

 but soda, lime, and chlorine, and the latter in precisely its 

 original quantity. 



By acting on chabazite with dilute chloride of ammo- 

 nium (10 grams to 500 c.c. of water) for 10 days, the 

 mineral was altered, and contained 3.33 per cent of am- 

 monia. Digested 21 days, tlie mineral yielded 6.94 per 

 cent of ammonia, and also lost water. 



These ammonia-chabazites lost no ammonia at 212°, it 

 escaped only when the heat was raised so high that water 

 began to be expelled ; treated with warm solution of pot- 

 ash it was immediately evolved. The ammonia-silicate 

 was slightly soluble in water. 



As in the instances above cited, there occurred but a 

 partial displacement of lime. Eichhorn made correspond- 

 ing trials with solutions of carbonates of soda and am* 



