Earths. 197 



in Sweden. It is only found combined with the 

 black oxide of iron. It has, when extracted from 

 the mineral in which it is found, the appearance 

 of a fine white powder destitute of taste and 

 smell. It is much heavier than any of the earths, 

 its specific gravity being 4*842. 



VIII. GLUCINA was discovered in 1798, as a 

 constituent of those beautiful gems the beryl and 

 the emerald, from which it is obtained by fusing 

 them with potass, dissolving the mixture in mu- 

 riatic acid, and separating the ingredients. No 

 remarkable properties have hitherto been disco- 

 vered in this earth. 



IX. ZmcotfiA has been lately found as con- 

 stituting a part of a precious stone found in the 

 island of Ceylon, called jargon, or zircon, and 

 also in the hyacinth, another gem from the same 

 island. It is heavy, and fuses into a very hard 

 grey mass, resembling porcelain. 



