150 



PHYSIOGRAPHY. 



Corundum. 



Fig. 151. 



Pon P' 

 P on a 

 P on o 

 p on o 

 p on a 

 o on a 

 p on P 

 h on h 

 h on a 

 h on o 

 Pon A 



= 86 4' 



122 30 



137 30 



151 30 



118 30 



90 00 



154 7 



128 20 



118 56 



151 17 



154 2 



PHILLIPS. 



Cleavage parallel with a perfect : but sometimes inter- 

 rupted by conchoidal fracture. The faces obtained in the 

 direction of P are commonly the result of composition. The 

 faces of cleavage and regnlar composition are striated par- 

 allel to their common edges of intersection. Fracture con- 

 choidal to uneven. Surface a striated parallel to the edges 

 of combination with P. The isosceles pyramids are often 

 deeply striated in a horizontal direction. 



Lustre vitreous, much inclining in some varieties to pearly 

 upon a. Color, blue, red, green, yellow, brown, grey and 

 white. Some of the blue, red and yellow colors, very 

 lively and beautiful. Streak white. Transparent . . .trans- 



