628 MINERALOGY 



Melanotekite, Pb3Fe 4 Si 3 Oi5 ; Brown to black ; Yellowish 



brown ; H. 5-5.5 ; G. 5.86 ; F. 2.5 ; IV. 

 4. Contains lead only. 



Lead, Pb; Lead-gray; Str. Lead-gray; H. 1.5; G. 

 11.37; F. 1; I. 



Plattnerite, PbO 2 ; Iron-black; Str. Brown; H. 5-5.5; 

 G. 8.5; F. 1.5; II. 



B. With von Kobell's flux shows lead and bismuth. 



1. With HC1 a strong copper chloride flame. 



Aikinite, 3 (Pb,Cu 2 )S.Bi 2 S 3 ; Lead-gray ; Str. Grayish 

 black; H. 2-2.5; G. 6.7; F. 1-1.5; IV. 



2. Reduced with soda and cupeled yields silver; a, 



p. 578. 



Schirmerite, 3 (Ag 2 .Pb)S.2Bi 2 S 3 ; Lead-gray; Str. Gray- 

 ish black ; G. 6.75 ; Massive. 



Schapbachite, PbS.Ag 2 S.Bi 2 S 3 ; Lead-gray; Str. Gray- 

 ish black ; H. 3.5 ; G. 6.43. 



3. When reduced yields neither copper nor silver. 



Galenobismuthite, PbS.Bi 2 S 3 ; Lead-gray; Str. Grayish 



black ; H. 3-4 ; G. 7.00 ; Columnar. 

 Chiviatite, 2PbS.3Bi 2 S 3 ; Lead-gray; Str. Grayish 



black ; G. 6.92 ; Foliated. 

 Rezbanyite, 4 PbS.5Bi 2 S 3 ; Lead-gray; Str. Grayish 



black ; H. 2.5-3 ; G. 6.24 ; Massive. 

 Cosalite, 2PbS.Bi 2 S 3 ; Lead-gray ; Str. Grayish black ; 



H. 2.5-3; G. 6.58; F. 1-1.5; IV. 

 Lillianite, 3 PbS.Bi 2 S 3 ; Steel-gray ; Str. Grayish 



black; G. 6.1 ; F. 1-1.5; Massive. 

 Beegerite, 6 PbS.Bi 2 S 3 ; Gray; Str. Grayish black; 



Cl. Cubic?; G. 7.27; I?. 



C. With von Kobell's flux shows bismuth, but no lead. 



1. Roasted and moistened with HC1 yields a strong copper 



chloride flame. 

 Emplectite, Cu 2 S.Bi 2 S 3 ; Grayish white; Str. Black; 



H. 2; G. 6.40; F. 1; IV. 

 Wittichenite, 3 Cu 2 S.Bi 2 S 3 ; Grayish white ; Str. 



Black; H. 3.5; G. 6.70; F. 1; IV. 

 Klaprotholite, 3 Cu 2 S.2 Bi 2 S 3 ; Steel-gray; Str. Black ; 



H. 2.5 ; G. 4.60 ; F. 1 ; IV. 

 Cuprobismutite, 3 Cu 2 S.4 Bi 2 S 3 ; Bluish black; Str. 



Black ; G. 6.49 ; F. 1 ; Prismatic. 



