96 Elements of Mineralogy. 



fliewn. 20 Roz. 42 9 * And fome few 

 lytes do not becorae gelatinous. 3 Bergm* 

 228. 



When expofed to a ftrong heat it dilates 

 and fwells, more or lefs, according to the 

 proportion of water contained in it, and af- 

 terwards melts per fe, more or lefs eafily, ac- 

 cording to the proportion of calcareous 

 Earth, into a frothy flag ; in the moment of 

 fuiion it is faid to become phofphorefcent ; it 

 alfo melts eafily, and with effervefcence, with 

 mineral alkali ; fomething more difficultly 

 with borax, but microcofmic fait has icarce 

 any effecl: on it. When in fuiion, it fcarcely 

 injures the crucibles. 22 Roz. p. 29. This 

 difetibility is the fureft criterion whereby to 

 diftinguifh zeolytes. The Upland zeolytes 

 are difficultly fuiible. 



According to Mr. Bergmans analyfis, the 

 red zeolyte of Adelfors contains 80 per cent, 

 of filiceous Earth, 9,5 of argillaceous, 6,5 

 of pure calcareous Earth, and 4 of water. 

 Van Troll's Letters, p. 370. 



The white, oval, radiated zeolyte of Pero* 

 contains, according to Mr. Pelletier^ 50 of 

 filex, 20 of argilL 8 of pure calcareous 

 Earth, and 22 of water. 20 Roz. 420. Mr. 

 Meyer found another of the radiated fort to 



contain 



