ORDEtt Vin. PYRAMIDAL TITAXIL'M-OIIE. 379 



tiful varieties of it, engaged in transparent Quartz, have 

 been brought from Brazil. 



4. The oxide of Titanium has been used in painting upon 

 porcelain. 



3. PYRAMIDAL TITANIUM-ORE. 



Pyramidal Titanium-Ore or Octahedrite. JAM. Svst. 

 Vol. III. p. 137- Man. p. 235. Anatase- Octahedrite. 

 PHILL. p. 25J. Oktaedrit. WERX. Hoifra. H. B. IV. 

 S. 249. Anatas. HAUSM. I. S. 322. Anatas. L.EONH. 

 S. 145. Anatase. HAUY. Traite', T. III. p. 129. 

 Titane anatase. Tabl. comp. p. 116. Traite', 2de Ed. 

 T. IV. p. 344. 



Fundamental form. Isosceles four-sided pyramid. 

 P = 97 56', 126 22'. Vol. I. Fig. 8. R. G. 



a = V 6-240. 



Simple forms. P x (o) ; J P 4 (r) = 148 

 5(X, 53 & ; P 1 = 104 3', 120 58' ; P (P) 

 Dauphiny; P + 1 (q) = 94 15', 148 23'; 

 P+oo/dP 7)*? (*). 



Char, of Comb. Pyramidal. 



Combinations. 1. P oo. P. Sim. Fig. 92. 



2. | P 4. P. Sim. Fig. 105. 



3. P x. P 1. P. P + 1. 



4. p oo. I P 4. (|P 7) 4 . P. P-f-1. 

 Fig. 100. All of them from Dauphiny. 



Cleavage, P oo and P, both perfect. Fracture 

 conchoidal, scarcely observable. Surface smooth 

 and shining, P + co and sometimes also P, ho- 

 rizontally streaked. 



Lustre metallic adamantine. Colour, various shades 

 of brown, more or less dark, also indigo-blue. 

 Streak white. Semi-transparent . . . translucent. 



