Intelligence and Miscellaneous Articles, 



461 



Tourmalines which contain potash or soda, or both together, without 

 lithia, and without a notable quantity of magnesia. The following 

 are the varieties : — I.' Black Tourmaline from Bovey in Devonshire, 

 found with quartz and phosphate of lime ; sp. gr. 3*246. II. Black 

 Tourmaline from Eibenstock in Saxony; sp. gr. 3' 123. III. Green 

 Tourmaline from Chesterfield, North America, sp. gr. 3' 102. 



Tourmalines which contain a considerable quantity of magnesia. — 

 Four specimens were analysed : — I. Black Tourmaline from Karing- 

 bricka, a province of Westmanland in Sweden ; sp. gr. 3044. II. 

 Black Tourmaline from Rabenstein in Bavaria; sp. gr. 3*113. III. 

 Black Tourmaline from Greenland ; sp. gr. 3*062. IV. Deep Brown 

 Tourmaline, from the mica slate of St.-Gothard. 



M. Gmelin is at a loss to what cause to attribute the deficiency in 

 the last analysis. He thinks the tourmaline from St.-Gothard should 

 be again examined; especially as the loss in Bucholz's analysis is 

 still greater. — Ann. de Chimie etde Phys. Nov. 1827. 



* With potash and a trace of magnesia. 



f With a trace of magnesia. 

 A NEW 



