Bl I.IMIIDI. MINERALS 



629 



J. Yields no copper, but redueed with soda ami cupeled 



yields silver ; p. 578. 

 Matildite, A-S l',iS :t ; Gray; Str. Gray; H. 2-3?; 



G. 6.92; Slender prism-, 

 3. Yields neither copper nor .silver. 



BISMUTH, Bi; C. and Str. Silver-white; H. 2-2.5; 



G. 9.8; F. 1; Cl. Basal; III. 

 BISMUTHINITE, Hi,S.,; Lead-gray; H. 2; G. 6.45; 



F. 1 ; IV ; p. 296. 



VI. Yields sulphur dioxide when powdered and heated in the O. F. 

 on coal, or fused with soda yields a strong sulphur re- 

 action on silver, some may yield slight gray coats. 



A. In the closed tube with soda yields mercury. 



CINNABAR, HgS; Vermilion; Str. Red; H. 1-2.5; 



G. 8.10; F. 1.5; III; p. 304. 



B. Well roasted then reduced with soda and borax yields copper 



buttons. 



1. The roasted powder is magnetic. 



CHALCOPYRITE, CuFeS 2 ; Brass-yellow; Str. Green- 

 ish; H. 3.5; G. 4.20; F. 2; II; p. 310. 



BORNITE, Cu 3 FeS 3 ; Purplish bronze; Str. Grayish 

 black; H. 3; G. 5-5.4 ; F. 2; I; p. 310. 



Cubanite, CuFe 2 S 4 ; Brass-yellow; Str. Black; H. 4; 

 G. 4.05; F. 2; Cl. Cubic; I. 



Stannite, Cu 2 S.FeS.SnS 2 ; Steel-gray; Str. Black; H. 

 4; G. 4.4; F. 1.5; p. 312. 



2. The roasted mineral is not magnetic. 



CHALCOCITE, Cu 2 S; Steel-gray; Str. Black; H. 



2.5-3; G. 5.7; F. 2-2.5; IV; p. 300. 

 COVELLITE, CuS; Blue; Str. Grayish black; H. 



1.5-2; G. 4.6; F. 2.5; III; p. 306. 

 a. The nitric acid solution shows silver ; 6, p. 578. 



Stromeyerite, CuAgS; C. and Str. Dark steel-gray; 



H. 2.5-3; G. 6.22; F. 1.5; IV. 

 6. Shows vanadium, b, p. 577. 



Sulvanite, 3 CuS.V 2 S 5 ; Bronze-yellow ; Massive. 



C. The nitric acid solution shows silver or reduced ivith soda yields 



silver buttons; p. 578. 

 1. The roasted mineral is magnetic. 



Sternbergite, AgFeoSs r Bronze; Str. Black; H. 1-1.5; 

 G. 4.15; Cl. Basal; F. 1.5; IV. 



