ANTIMONY MINERALS 



8. Yields test> for platinum; p. 582. 



Sperrylite, PtAs*; Tin-white; Str. Black; H. 6-7; 



G. 10.6 ; F. 2 ; I ; p. 287. 



II. The coat is white, and colors the inner flame pale yellowish 

 green (antimony). The presence of antimony may 

 be proven by the tests ; p. 584. 



A. Easily and completely volatile (when pure) on coal. 



1. Yields with soda a strong sulphur reaction. 



STIBNITE, Sb; Tin-white; Str. Gray; H. 2; G. 4.57; 

 F. 1 ; I V ; p. 295. 



2. With soda in the closed tube yields mercury, p. 579. 



Livingstonite, HgS.2 Sb 2 S J ; Lead-gray ; Str. Gray- 

 black ; H. 2; G.4.8; F.I; IV. 



3. Yields with soda no sulphur reaction. 



ANTIMONY, Sb; Tin-white; Str. Gray; H. 3-3.5; G. 

 6.69; F. 1; Cl. Basal; III. 



B. Not entirely volatile on coal. 



1. With soda yields a sulphur reaction. 



a. Roasted and moistened with HC1 yields a copper chlo- 

 ride flame; p. 581. 



+. With von Kobell's flux shows lead. 

 BOURNONITE, 2 PbS.Cu 2 S.Sb 2 S 3 ; Steel-gray; Str. 

 Black ; H. 2.5-3 ; G. 5.8 ; F. 1 ; IV ; p. 321. 



. With von Kobell's flux shows neither lead nor bis- 

 muth. 



Stylotypite, 3 (Cu 2 .Ag 2 .Fe)S, Sb 2 S 3 ; Iron-black; H. 3; 

 G.4.8; F. 1.5; IV. 



Famatinite, 3 Cu 2 S.Sb 2 Ss ; Gray; Str. Black; H. 3.5; 

 G. 4.57; F. 1-1.5; IV. 



Chalcostilbite, Cu^.Sb-jSs ; Blackish gray ; Str. Black ; 

 H. 3.5; C. basal; G. 4.9; F. 1.5; IV. 



Some tetrahedrites, p. 324, and polybasites may fall in 



this group. 

 6. Do not yield with HC1 a copper chloride flame. 



+. With von Kobell's flux shows lead. 



a. Reduced with soda and cupeled shows silver; a, 

 p. 578. 



Andorite, 2 PbS.Ag 2 S.3 SbaSa ; Steel-gray; Str. Black; 

 H. 3-3.3 ; G. 5.33 ; F. 1 ; IV. 



Brongniardite, PbS.AgjS.SbjS, ; Black ; Str. Black ; 

 H. 3-3.5; G. 5.95; F.I; Massive. 



