ZINC AND HISMlTll MINERALS <il'.> 



Vanadinite, Pl> 4 (l'b.< ; Kul.y-ml, brown, 



low; H. 3; G. 6.83; F. !.:; III. 



d. Shows tungsten ; 6, p. 587. 



STOLZITE, P1AVO,; < iivm. yrllow, brown, rl : 

 Eteonoua; H. 3; G. 8.00; F. 2.:. : II: p. 545, 



Raspite, PbWO 4 ; Wax-brown; Kcsinoiis; ( '1. pina- 

 coidal; H. 2.5-3; G.?; F. 2.5-3: \. 



e. Shows chromium; 6, p. 569. 



CROCOITE, PI>CrO 4 ; Bright red; Adamantine; II. 



2.5-3; G. 6.00; F. 1.5; V; p. 533. 

 Phoenicochroite, 3 PbCrO 4 .PbO ; Red; Resinous; Cl. 



pinacoidal; H. 3-3.5 ; G. 5.75 ; F. 1.5; IV. 

 /. Lead oxides only. 



Plattnerite, Pb0 2 ; Brown-black; H. 5-5.5; G. 8.50; 



F. 1.5; II. 



Minium, Pb 3 O 4 ; Red; Dull to greasy; H. 2-3; G. 



4.60; F. 1.5; Pulverulent. 

 Massicot, PbO ; Sulphur- to reddish yellow ; Dull ; 



H. 2; G. 8-9; F. 1.5; Massive. 

 IV. Fused with soda and borax in the R. F. on coal, it yields a 



coat. 

 A. It yields a zinc oxide coat; 6, p. 573. 



1. Yields with soda a sulphur reaction; 6, p. 587. 



a. In R. F. becomes magnetic. 



Danalite, (Zn.Fe) 2 (Fe 2 .S)Be3(Si0 4 )3 ; Flesh-red to gray ; 

 H. 5.5-6 ; G. 3.43 ; F. 5. 



b. Dissolves in HC1, yielding H 2 S. 



SPHALERITE, ZnS ; White, green, yellow, brown, 

 black; H. 3.5-4; G. 4.10; F. Difficult; I; p. 301. 



2. Effervesces with HC1, yielding CO 2 (carbonates). 



SMITHSONITE, ZnCO 3 ; White, brown, green, pink; 



H. 5; G. 4.37; Inf.; Ill; p. 391. 

 Hydro/incite, 2 ZnCO 3 .3 Zn(OH) 2 ; White, gray, yellow; 



H. 2-2.5; G. 3.69; Compact. 



3. Gelatinizes with HC1. 



a. Yields little or no water. 



WILLEMITE, Zn 2 SiO 4 ; White, yellow, green, blue; 



H. 5.5; G. 4.10; Inf.; Ill; p. 451. 

 Hardystonite, Ca 2 ZnSi 2 O 7 ; White ; H. 3-4 ; F. Difficult ; 



G. 3.39 ; Yields a calcium flame. 

 6. Yields water. 



