552 Kraus and Goldsberry — Chemical Composition of 



Sb 2 S 3 -PbS Series 



Stibnite 



Zinckenite 



Jamesonite 





Sb 2 S 3 

 PbSb 2 "S 4 



Pb 2 Sb 3 S 5 



Specific gravity 

 5-32 

 5-4 

 5-57 



Meneghinite 



Geocronite 



Kilbrickenite 





Pb 4 Sb S, 



Pb 6 si>;s 8 



Pb 6 Sb 2 S 9 



6-399 

 6-3 — 6-45 

 6-4 



Galena 





PbS 



7-45 





Sb 2 S s 



-Ag 2 S Series 





Stibnite 

 Miargyrite 





Sb 2 S 3 

 Ag 2 Sb 2 S 4 



Specific gravity 

 5-32 

 5-18 — 5-3 



Pyrargyrite 





Ag 6 Sb 2 S 6 



5-85 



Stephanite 





AgXs. 



6-25 



Polybasite 

 Polybasite 





Agjsb-S^ 



Ag 18 Sb 2 S 12 



6-067 

 6-33 



Polyargyrite 





Ag 24 Sb 2 S 16 



6-974 



Argentite 





Ag 2 S 



7-3 





BioS 3 



-PbS Series 





Bismuthinite 

 Galenobismutite 

 Cosalite 

 Lillianite 



Bi 2 S 3 

 PbBi„S 4 

 Pb 2 Bi 2 S 6 

 Pb 3 Bi 2 S 6 



Specific gravity 

 6-5 



6-88 — 7-14 

 6-39 — 6-75 

 6-7 



Beegerite 





Pb 6 Bi 2 S 9 



7-273 



Galena 





PbS 



7-45 





Bi 2 S 3 - 



-Cu 2 S Series 





Bismuthinite 

 Emplectite 





Bi 2 S 3 



Cu 2 Bi 2 S 4 



Specific gravity 

 6-4-6-8 

 6-3 — 6-5 



Chalcocite 





Cui 



5'51 



A preliminary survey of several of these series shows that 

 some very interesting relationships can be pointed out, for with 

 but few exceptions the crystallization of the various members 



