668 MINERALOGY 



Keilhauite, CaTiSiO 6 (Y.Al.Fe) 2 SiO B ; Brownish black; 



Cl. prismatic ; H. 6.5 ; G. 3.65 ; F. 4-4.5 ; V. 

 Neptunite, (Na.K)(Fe.Mn)TiSi 4 O 12 ; Black; Cl. pris- 

 matic; H. 5-6; G. 3.23; F. 3.5; V. 

 Benitoite, BaTiSiO 5 ; Colorless, blue ; H.6.5 ; G. 3.64 ; 



III. 

 Mosandrite, H 12 Na 2 , Ce 2 , Ca 10 [(Ti.Zr)(OH.F) 2 ]4(SiO 4 )i 2 ; 



Reddish to greenish brown; Resinous; Cl. one; 



H. 4 ; G. 2.96 ; Compact. 

 b. Fusibility above 5. 



PEROVSKITE, CaTiO 3 ; Yellow, orange, brown, black ; 



Cl. cubic ; H. 5.5 ; G. 4.93 ; I ; p. 347. 

 RUTILE, Ti0 2 ; Yellow, reddish brown to black ; Cl. 



prismatic ; H. 6-6.5 ; G. 4.22 ; Int. ; II ; p. 349. 

 OCTAHEDRITE, Ti0 2 ; Yellow, brown, blue, black; 



Cl. basal and pyramidic ; H. 5.5-6 ; G. 3.88 ; II ; p. 



351. 

 BROOKITE, TiO 2 ; Hair-brown to black; H. 6; 



G. 3.94; IV; p. 351. 

 Zirkelite, (Ca.Fe.UO 2 )(Zn.Ti) 2 O 5 ; Black; Resinous; 



H. 5 ; G. 4.71 ; I. 

 XII. The solution is blue (tungsten) or (columbium). Fusibility 



above 5. 



1. The solution first assumes a violet color and then becomes 



blue. . 



^schynite, Cb, Ti, Th, Ce, La, Ca, Fe, O?; Brownish 

 black to black ; Resinous ; H. 6.5 ; G. 4.93 ; Inf. ; 

 IV. 



Euxenite, Cb, Ti, Y, Er, Ce, U, Fe, H, O, ? ; Brownish 

 black to black ; Resinous ; H. 6 ; G. 5.00 ; IV. 



Polycrase, Cb, Ti, Y, Er, Ce, U, Fe, H, O, ? ; Brownish 

 black to black ; H. 6 ; G. 5.00. 



Pyrochlore, Cb, Ti, Ca, Na, O, Th, Ce, Fe, F?; Brown- 

 ish black to black ; H. 5-5.5 ; G. 4.28 ; I. 



2. The solution is blue without passing through violet. 



SCHEELITE, CaWO 4 ; White, yellow, green, brown; 



Cl. pyramidal ; H. 4.5-5 ; G. 6.05 ; II ; p. 543. 

 Tungstite, WO 3 ; Yellow, greenish yellow; dull; IV; 



Earthy. 

 Hatchettolite, Cb, Ta, U, Ca, 0, H, Fe ? ; Yellowish 



brown ; Resinous ; H. 5 ; G. 4.85 ; I. 



