232 Extracts from the third Folume of 



Anahjsh of the Native Antimony of ylndr easier g. 



Hitherto native antimony has been found in three places 

 only : 



1st. In the sih'cr mine of Sala and Weestmannland, 

 where Swab discovered it in a matrix of calcareous spar- 

 ed. In the mines of Challenges, near Allemont, in the 

 department of Isere. For the analysis of it we are indebted 

 to M. Sage. 



3d. In the mine of Catherine Neufung, at Andreasbergi 

 in the Harz, where it is found in considerable masses. 



It has the white colour of tin, inclining to leaden sray. 

 It is compact, and has a ffreat deal of metallic splendour. 

 On the fracture it is foliated. The fragments exhibit a t<;rain 

 sometimes thie and sometimes coarse. It has a mean hard- 

 ness, and is soft to the touch. Its specific gravity is 6720. 

 The matrix of it is calcareous spar, quartz, &c. 



It exhibits the same phaenomena with the blowpipe as 

 regulus of antimony extracted from its ores. It fuses very 

 speedily into globules, and is dissipated in gray inodorous 

 fumes, which adhere to surrounding cold bodies. If the 

 metallic button be left to cool slowly, it is found to be co- 

 vered by and surrounded with white brilliant argentine crys- 

 tals. After total volatilization it leaves a small globule of 

 silver. 



A hundred parts of native antimony of Andreasberg con- 

 tain 



Antimony • - - - 98 

 Silver - - - _ i 

 Iron - - - - 0-25 



99-29 



It is probable that the silver is combined with it only 

 accidentally. 



Analysis of the Argentiferous Antimony of AndreasLerg. 



This is one of the richest and oldest silver ores in that 

 country. It was formerly considered as arsenical silver, 

 which is found there also, but nuich more rarely. 



M. Klaproth in his analysis employed a variety which 

 has been dug up for several vears past. It is of a hard 

 grain, crystallized, and foliated on the fracture. By its 

 external characters, and the considerable quantity of silver 

 it contains, it approaches near to the antimoniated silver of 

 Akwolfachj in Furstemberg. Its specific gravity is 9820, 



Exposed 



