MINERALOGY. n;. 



6. In the very moment cf fufion it gives a 

 phcfphorus or light. 



SECT. CIX. 



The zeolites is found in an indurated date, 

 i . Solid, or of no vifible particles, Zeolites fc- 

 lidus particulh impalpabilibus. 

 A- Pure, Zeolites dy.rus. 



a. White, from Iceland. 

 B. Mixed with filver and iron. 



a. Blue, Lapis lazuli, from the Buckarian 

 Calmucks. 



This, by experiments made with it, 

 has difcovered the following proper- 

 ties. 



i. It retains for a long time its blue in 

 a calcining heat, but is at laft changed 

 into a brown colour. 



2. Ii: melts eafily in the fire to a white 

 frothy flag •, which, when expofed to 

 the flame of a blow-pipe, is greatly 

 puffed up, but in a covered veffel, 

 and with a flronger heat, becomes 

 clear and fclid, with blue clouds in 

 it. 



3. It does not ferment with acids : 

 but, 



4. Boiled in the oil of vitriol, it dif- 

 folves flowiy, and lofes its blue co- 

 lour. 



When a fixed alcali is added to this 

 folution, a white earth is precipitated, 

 which being fcorified with borax, yields 

 a filver regulus, that varies in big- 

 nefs, according to the various famples 

 of the {tone. 



I 3 5- By 



