466 CHARACTERISTIC. CLASS II. 



VIII. ORDER. ORE. 



I. TITANIUM-ORE. Pyramidal, prismatic. 



Streak uncoloured ... very pale brown. 

 H. = 5-0 ... 6-5. 

 G. =3-4 ... 4-4. 



G. under 4-2 : streak uncoloured. 



1. PRISMATIC. Hemi-prismatic. == 113 20'. Inclina- 



tion = 8 18'. (Pr -1- os) 3 =136 8'. 

 Cleavage, . ? = 28 7', difficult. 



Streak uncoloured. 

 H. = 5-0 ... 5-5. 

 G. = 3-4 ... 3-6. 



Sphene. ii. 373. 



2. PERITOMOUS. Pyramidal. P= 117 2', 95 13'. 



Cleavage, P 4- os. [P + ]. 

 Streak pale brown. 

 H. = 6-0 ... 6-5. 

 G. = 4-2 ... 4-4. 



Rutile. ii. 376. 



3. PYRAMIDAL. Pyramidal. P = 97 56', 130 22'. 



Cleavage, P oo. P. 

 Streak uncoloured. 

 H. = 5-5 ... 6-0. 

 G. = 3-8 ... 3-9. 



Anatase. ii. 379. 



II. ZINC-ORE. Prismatic. 



Streak orange-yellow. 

 H. = 4-0 ... 4-5. 

 G. - 54... 5-5. 



