THE 



PHILOSOPHICAL MAGAZINE. 



I. Analysis of the Chromate of Iron from the Ourallan 

 Mountains in Siberia. Bj A. Laugikr*. 



-IVl. PoNTiKR, ill a tour made through the department of 

 Var, in the year 7, found, near La Bastide de la Cassade, a 

 mineral, which he sent to the Council of Mines under the 

 name of llende, and which M. Tassaert first discovered 

 to be a combination of chromic acid and oxide of iron. 



His opinion was afterwards confirmed by M. Vauquelin 

 in the tenth volume of the Journal de Mina ; where he at 

 the same time announced the proportions of chrome and 

 iron, together with the presence of alumlne and silica. 



M. Meder has since found in Siberia, in the Ouralian 

 mountains, on the banks of the Wiasga, a substance very 

 similar to the mineral of Var. A specimen of this having 

 been given to me by M. Steinachcr, member of the 

 corporation of apothecaries of Paris, who had received it 

 from count Mus.^in Pusehkin, counsellor of the mines of 

 Russia, I conceived it might be useful to examine it, and 

 compare the results of my examination with the aualysis ;f 

 the mineral of Var published by M. Vauquelin, fully per- 

 fauaded that my labours would be rewarded with some ad- 

 vantage. 



Phi/sical Properties. 



Although the mineral of Siberia be very similar in ap- 

 pearance to that of Var, an atttentive examination of it 

 would lead us to suspect, that in the lirst of these the 

 metal is purer and more abundant than in the second; its 



* From Annalrs ik Museum (VITn.to-'re Xaturelle, No. 35. 



Vol. 21. No. 93. Feb. 1806. A 2 fracture 



