ORDER VIII. PRISMATIC TITAXIUM-ORE. 373 



3. Prismatic Gadolinite occurs in gneiss and granite, in 

 repositories that have been considered as beds and as veins. 

 It is chiefly accompanied by prismatic Feld-spar and Al- 

 bite, rhombohedral Quartz, &c. Its localities are Ytterby 

 near Stockholm, and Finbo and Broddbo near Fahlun in 

 Sweden. It is likewise found in Greenland. 



ORDER VIII. ORE. 



GENUS I. TITANIUM-ORE. 



1. PRISMATIC TITANIUM-ORE. 



Prismatic Titanium.Ore or Sphene. JAM. Syst. VoL III. 

 p. 121. Man. p. 232. Sphene. PHILL. p. 262. Braun- 

 Menakerz. Gelb-Menakerz. WERN. Hoffm. H. B. 

 IV. 1. S. 260. 263. Spheu. HAUSM. II. S. 613. Ti- 

 tanit. LEONH. S. 596. Sphene. Titane silice'o-cal- 

 caire. HAUY. Traite', T. III. p. 114. T. IV. p. 307. 

 Titane siliceo-calcaire. Tabl. comp. p. 116. Titane cal- 

 care'o-siliceux. Traite', 2de Ed. T. IV. p. 353. 

 G. ROSE. De Sphenis atque Titanitae systemate crys- 

 tallino. BeroL 1820. 



Fundamental form. Scalene four-sided pyramid. 

 P = , 89 46', 131 8'. Inclination 



of the axis = 8 18' in the plane of the short dia- 

 gonal. Vol. I. Fig. 41. ROSE. 



a : b : c : d = 6-35 : 4-05 : 4-97 : I. 



Simple forms. P QD (v); (r) == 113 37'; 



* p a m - 133 4,8' ; C0 s s \ _ 67 o 

 2 2 



46'; (Pr + OD)* (n) = 136 8'; ^rp^.! ( O ) 

 = 155 35'; <SJt^51 (J/) = 76 l' ; 



