670 MINERALOGY 



a. Yields a reaction for vanadium ( b, p. 576), as well as 



for uranium. 



Carnotite, K 2 (UO 2 ) 2 (VO 4 ) 2 .3 H 2 ; Yellow; Dull; H. 

 2.5 ; F. 3 ; Earthy. 



3. Shows vanadium ; b, p. 576. 



Roscoelite, H 8 K 2 (Mg.Fe)(Al.V) 4 (SiO 3 )i2?; Clove-brown 

 to brown-green; Pearly; Cl. basal; H. 2?; G. 

 2.93 ; F. 3. 



4. Shows molybdenum ; b, p. 586. 



a. The concentrated HC1 solution yields a white precipi- 



tate with H 2 SO 4 . 



Powellite, CaMo0 4 ; Colorless, green, yellow ; Resin- 

 ous; H. 3.5; G. 4.52; F. 4; II. 



b. Yields no precipitate with H 2 S0 4 . 

 Belonesite, MgMoO 4 ; White ; F. 4-5 ; II. 



XIV. Minerals not included in the preceding groups. They are 

 classified according to their fusibility, solubility in acids, 

 and hardness. 

 A. Fusibility below 5. 

 1. Hardness below 5. 



+. Yields water. 

 a. Soluble in HC1 or decomposed with the separation of 



silica. 



. Fuses with -intumescence or exfoliates. 

 VERMICULITE, Si, Al, Mg, O, (H 2 O), ?; Yellow, 

 brown, light to dark green ; Pearly ; Cl. basal ; 

 H. 1.5; G. 4-4.5; F. 4.5. 

 The dilute HC1 solution yields a precipitate with H 2 S0 4 



(barium). 

 HARMOTOME, (Ba.K 2 )Al 2 Si 5 Oi 4 .5 H 2 O ; White ; Cl. 



pinacoidal; H/4.5. ; G. 2.47; F. 3 ; V; p. 482. 

 Brewsterite, H 4 (Sr.Ba.Ca)Al 2 (Si0 3 ) 6 .3 H 2 O ; White, 

 yellow, gray ; Cl. pinacoidal ; H. 5 ; G. 2.45 ; F. 3 ; V. 

 Wellsite, (Ca.K 2 .Ba) Al 2 Si 3 Oi .3 H 2 ; White ; H. 4-4.5 ; 



G. 2.32 ; F. 3 ; V. 

 The dilute HC1 solution yields no precipitate with 



H 2 SO 4 . 



HEULANDITE, H 4 (Ca.Na2)Al 2 (Si0 3 )6.3 H 2 O ; White, 

 yellow, red ; Pearly, Cl. pinacoidal ; H. 3.5-4 ; G. 

 2.20; F. 3; V; p.- 481. 

 STILBITE, H4(Ca.Na2)Al 2 (Si03) 6 .4 H 2 ; White, yel- 



