SILVl-.lt AND TIN MINERALS <ii:> 



h. He:ited in ;i closed lulu with pi-t :i>.-iuili bUulph:te it 



yield- NO,; $a,p, -'.'Ml. 



Gerhardtite, Cu .. <>ll ; l>--p emerald-un-en ; ('I. 

 basal; II. 2; G. 3.42; F. 3; IV. 



c. Heated ;i- in b it yield.- iudine; a, p. 589. 



Marshite, Cul; Reddish l>ro\\n; Re-inou~ ; I 1.5; I 

 Cuproiodargyrite, Agl.CuI ; Sulphur-yellow; H. 2; 

 Massive. 



d. It yields a vanadium reaction ; 6, p. 577. 

 Volborthite, (Cu.()H) s VO 4 .6 H,O ; CI. pinucoidal ; H. 



3-3.5; G. 3.55; F. 1.5; Tabular. 



Calciovolborthite, (Cu.Ca)(Cu.OH)VO 4 ; Pistachio- to 

 olive-green; H. 3.5; G. 3.86 ; F. 1.5-2; Tabular. 



e. It yields a tungsten reaction ; 6, p. 587. 

 Cuprotungstite, CuWO 4 ; Pistachio-green; ('I. pina- 



eoidal; H. 4.5-5; F. 3; Granular. 

 /. It yields a reaction for selenium; a, p. 587. 



Chalcomenite, CuSeO 3 .2 H 2 O ; Blue; H. 2.5-3; G. 



3.76; F. 1.5; V. 



B. Treated as in III, it yields silver buttons or it contains silver, 

 but no Cu. 



1. Alone in R. F. on coal it yields an arsenical odor. 



PROUSTITE, 3Ag 2 S.As2S 3 ; Ruby-red; Adamantine; 



H. 2-2.5? G. 5.55; F. 1 ; III ; p. 323. 

 Xanthoconite, 3 Ag 2 S.As 2 S 3 ; Orange-yellow to brown ; 



CI. basal ; H. 2 ; G. 5.54 ; F. 1 ; V ; Tabular. 



2. Yields in R. F. on coal an antimony coat. 



PYRARGYRITE, 3 AgsS.SbaSs ; Dark-red to black; 



H. 2.5 ; G. 5.85 ; F. 1 ; III ; p. 322. 

 Pyrostilpnite, 3Ag 2 S.Sb 2 S 3 ; Hyacinth-red ; H. 2 ; 



G. 4.20 ; F. 1 ; V ; Tabular. 



3. With copper oxide it shows chlorine. 



CERARGYRITE, AgCl ; Gray to colorless ; H. 2-3 ; 



G. 5.55 ; F. 1 ; I ; p. 330. 

 lodobromite, Ag(Cl.Br.I) ; Sulphur-yellow to green ; 



H. 2-3; G. 5.90; F. 1 ; I. 



4. Shows bromine ; d, p. 58.9. 



EMBOLITE, Ag(Br.CI) ; Green or yellow; H. 2-3; 



G. 5.80 ; F. 1 ; I ; p. 330. 

 Bromyrite, AgBr ; Green to yellow; H. 2-3 ; G. 5.90; 



F. 1 ; I. 



