626 MINERALOGY 



Griinlingite, Bi 4 S 3 Te; Pale steel-gray; Str. Gray; G. 



7.8; F. 1; H. 1.5-2; III. 

 Tapalpite, 3 Ag 2 (S.Te).Bi 2 (S.Te) 3 ; Pale Steel-gray; 



Str. Gray ; G. 7.8 ; F. 1 ; Massive. 

 C. With von KobeWs flux shows neither lead nor bismuth. 



1. Easily fusible and volatile. 



TELLURIUM, Te; Tin-white; Str. Gray; H. 2-2.5; 



G. 6.15; F. 1; Cl. Prismatic; III. 

 a. With soda in the closed tube yields mercury. 



Coloradoite, HgTe ; Iron-black ; Str. Black ; H. 3 ; G. 

 8.63 ; F. 1 ; Massive. 



2. Not entirely volatile. 



a. Roasted and reduced with soda yields gold and silver; 



a, p. 578. 



. With soda in the closed tube yields no mercury. 

 Petzite, (Ag.Au) 2 Te ; Iron-black ; Str. Gray ; H. 2.5-3 ; 



G. 8.86; F. 1.5; Massive. 

 SYLVANITE (Au.'Ag)Te 2 ; Silver-white; Str. Gray; 



H. 1.5-2; G. 8.10; F. 1 ; V. 

 Goldschmidtite, Au 6 AgTe 6 ; Silver-white; Str. grayish 



black ; H. 2 ; G. 8.6 ; F. 1 ; V. 

 Krennerite, AuTe 2 + Ag ; Silver-white ; Str. Gray ; H. 



2.5; G. 8.35; F. 1; IV; Cl. Basal. 

 CALAVERITE, AuTe 2 + Ag; Silver-white; Str. Gray; 



H. 2.5; G. 9.04; F. 1; VI. 

 + . With soda in a closed tube yields mercury. 

 Kalgoorlite, HgAu 2 Ag 6 Te 6 ; Iron-black; G. 8.76; Mas- 

 sive. 

 6. Reduced with soda yields silver only. 



HESSITE, Ag 2 Te; Steel-gray; Str. Gray; H. 2.5-3 ; 



G. 8.60 ; F. 1 ; I. 



c. The mineral well roasted and dissolved in borax. 

 +. The bead shows copper. 

 Richardite, Cu 4 Te 3 . 

 . The bead shows nickel. 

 Melonite, Ni 2 Te 3 ; Reddish white; Str. Gray; Cl. 



Basal; III. 

 IV. The coat is white with a metallic-like luster, also yields a 



selenium odor and colors the flame blue ; b, p. 587. 

 A. Completely volatile on coal. 



1. With soda in the closed tube yields mercury. 



