LEAD AND HISMITH MINI. HALS liL'7 



TIEMANNITE, HgS.- ; Blackish gray; Str. Black ; II 



2.5; G. 8.2; I. 

 Orofrite, Hg(S.S-j ; Blackish gray; Str. Black; H. 2.5; 



G. 8.0; Massive. 

 H. With von KobelVs flux shows lead. 



1. Reduced with soda, the button cupeled shows silver. 



Naumannite (Ag2.Pb)Se; Iron-black ; Str. Black; II 

 2.5; G. 8.0; F. 2; Cl. Cubic; I; Massive. 



2. Yields no -silver. 



Clausthalite, PbSe ; Lead-gray ; Str. Black ; H. 2.5-3 ; 

 G. 8; Cl. Cubic; F. 2 ; I. 



C. With von KobeWs flux shows bismuth. 



Guanajuatite, Bi 2 Se 3 ; Bluish gray ; Str. Black ; H. 2.5- 

 3.5; G. 6.43; F. 1.5; IV. 



D. With von KobelVs flux shows neither lead nor bismuth. 



1. Roasted, and reduced with soda shows copper and 



silver. 

 Eucairite, CuAgSe ; Lead-gray ; H. 2.5 ; G. 7.5 ; 



F. 2 ; I ; Massive. 



Crookesite, (Cu.Te.Ag) 2 Se ; Lead-gray ; Str. Black ; 

 H. 2.5-3 ; G. 6.9 ; F. 1 ; Massive. 



2. Yields, when reduced, copper but no silver. 



Berzelianite, Cu 2 Se; Silver-white; Str. Shining; H. 2?; 



G. 6.7; F. 1.5; Massive. 



Umangite, Cu 3 Se 2 ; Cherry-red; Str. Black; H. 3; G. 

 5.62; F. 1.5; Massive. 



3. Yields silver but no copper. 



Aguilarite, AgaSe.AgizS ; Iron-black; Str. Black; H. 



2.5; G. 7.6; F. 1 ; I. 

 V. The coat is yellow, at least near the assay. With von Kobell's 



flux shows lead or bismuth. 

 A . With von Kobell's flux shows only lead. 



1. Fused with soda shows sulphur on silver. 



GALENA, PbS; Lead-gray; Str. Grayish black ; H. 

 2.5 ; G. 7.6 ; F. 2 ; Cl. Cubic ; I ; p. 298. 



2. Fused with soda in O. F. shows manganese ; 6, p. 574. 



Kentrolite, (Mn4.O 3 )Pbs(Si.O 4 )3 ; Black; Str. Broun; 



H. 5-5.5; G. 6.19; F. 2-2.5; IV. 

 Senaite, (Fe.Pb) O.2 (Ti.Mn)O 2 ; Black ; Str. Brownish ; 



H. 6; G. 4.78; Inf.; III. 



3. Roasted in the R. F. becomes magnetic. 



