378 



Part of the salt 

 deoxigenated 

 by it. 



ANALYSES OF MINERALS. 



was discovered at tlie bottom of the vessel a sediment con» 

 .sisting of the bones of several mice, of small grains of 

 pyrites, of sulphur, of crystallized green sulphate of iron, 

 and of black muddy oxide of iron. 



These appearances may with much probability be at- 

 tributed to the mutual action of the animal matter and the 

 sulphate of iron, by which a portion of the metallic salt 

 seems to have been entirely disoxigenated. 



X. 



Analyses of Minerals : hy Martin Henry Klaproth, 

 P/t. Z). cVc. 



Analyses by 

 K lap roth. 



Electrum of 

 Pliny. 



Gold ore of 

 Schlagenberg. 



l\% the fonirth and fifth volumes of Klaproth's work have 

 not appeared in English, and are not likely to be trans^. 

 lated, the results of his analyses probably will not be un- 

 acceptable. Not having the work itself, they are taken 

 from the Journal de Physique. 



Analysis of electrum. 



This name is taken from Pliny, who says, book 33, 

 chap. 4, § 23. *' In all gold there is silver, in various pro- 

 portions. Sometimes a tenth, sometimes a ninth, some- 

 times an eighth part. When there is a fifth part of silver, 

 it is called electrum". 



In a gold ore from Schlagenberg in Siberia Klaproth 

 found 



Gold - - - 64 



Silver . - - 36 



100 

 silver ore from From a species of silver ore, called in Peru pacos, some 

 Peru. of which was brought over by von Humboldt, he obtained 



Silver 



Brown oxide of iron 



Silex 



Sand 



Water 



14 

 71 



3-5 



1 



8-5 



98 



Conchoid . 



