i i -imi.ny \i'.<>\ i:. HARDNESS i'-i i.o\V5 i7!> 



ALUNITE, (K.Na)(A1.2OH),(SO 4 ) 2 ; White, gray; 

 Cl. basal; H. 3.5-4; G. 2.85; III; p. 541. 



8. With potassium bisulphate yields a fluorine reac- 

 tion ; n, p. 589. 



Ralstonite, (Na2.Mg)F 2 .3 A1(F.OH) 3 .2 H 2 O; White to 

 >tra \v-ydlo\v; H. 4.5 ; G. 2.59; I. 



Prosopite, Ca(F.OH) 2 .2Al(F.OH) 8 ; White, gray; H. 

 4.5 ; G. 2.89 ; V. 



Fluellite, A1F 3 .H 2 O; White; H. 3; G. 2.17; IV. 



e. With cobalt solution becomes flesh-pink (magnesium). 



TALC, H 2 Mg 3 (SiO 3 )4; Apple-green, gray, white; Pearly, 

 greasy ; Cl. basal ; H.I; G. 2.80 ; Foliated, com- 

 pact; p. 500. 



. Yields no water. 



a. Fused with potassium bisulphate yields a fluorine re- 

 action. 



Tysonite, (Ce.La.Di)F 3 ; Wax-yellow, reddish brown; 

 Cl. basal; H. 4.5-5; G. 6.13; III. 



Bastnasite, (Ce.La.Di.F)C0 3 ; Wax-yellow, reddish 



brown ; H. 4.5-5 ; G. 5.08 ; Massive. 

 2. Hardness above 5. 



+ . Yields water. 

 a. Soluble in HC1. 



Pollucite, H 2 Cs 4 Al 4 (Si0 3 )9 ; White ; H. 5.5-6 ; G. 2.98 ; 



I ; Massive. 

 6. Gelatinizes with HC1. 



a. Fused with potassium bisulphate shows fluorine. 



CHONDRODITE, Mg3[Mg(F.OH)] 2 (SiO 4 ) 2 ; Brownish 

 red, yellow, white ; Cl. basal ; H. 6-6.5 ; G. 3.15 ; V ; 

 p. 471. 



Humite, Mg 5 [Mg(F.OH)] 2 (Si0 4 )3 ; Brownish red, yel- 

 low, white; Cl. basal; H. 6-6.5; G. 3.15; IV. 



Clinohumite, Mg 7 [Mg(F.OH)] 2 (SiO 4 ) 4 ; Brownish red, 

 yellow, white; Cl. Basal; H. 6-6.5; G. 3.15; V. 



Prolectite, Mg[Mg(F.OH)] 2 SiO 4 ; Brownish gray; V. 



ft. Yields the rare earths ; p. 572. 



CERITE, (Ca.Fe)(CeO)(Ce 2 .3OH)(SiO 3 ) 3 ; Clove- 

 hrown, gray, red; Dull, resinous; H. 5.5; G. 4.90; 

 IV. 



Thorite, ThSiO 4 , Orange-yellow, brown, black; Resi- 

 nous; Cl. prismatic ; H. 5; G. 4.90; II. 



