OF STRONTIAN. 287 



lustre is glassy, and it effloresces when exposed . 

 to the air. Its constituents are 



1 atom nitric acid 6'75 



I atom strontian 6-5 



4 atoms water 4-5 



17-75 



3. Carbonate of strontian. This salt, like the carbonate, 

 carbonate of barytes, is anhydrous ; the water 

 contained in the native carbonate amounts cer- 

 tainly to less than ^^th part of the whole. 

 The constituents of the pure carbonate are 



1 atom carbonic acid 2-75 

 1 atom strontian 6-5 



9-25 



The carbonate of strontian, from Strontian in 

 Argyleshire, contains rather more than 6 per 

 cent, of carbonate of lime ; or it is a compound 

 of very nearly 



1 atoms carbonate of strontian 92-5 

 1 atom carbonate of lime 6-25 



98-75 



Whether this mineral be a chemical compound, 

 or only a mixture, I cannot say ; but, from its 

 appearance, one would be disposed to believe 

 that the two carbonates are in chemical union. 



