ORDER JX. GENERA AND SPECIES. 441 



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

 G. = 4-7 ... 4-8. 



Black Manganese. J. ii- 416. 



UNCLEAVABLE. Reniform, botryoidal, massive. 

 Cleavage, none. 

 Streak brownish-black, shining. 

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

 G. = 4-0 ... 4-1. 



Black Manganese. J. " 418. 



3. PIUSMATOIDAL. Prismatic. 



Cleavage, Pr + oo perfect, less distinct P + w = 99 40'. 

 Streak black. 

 H. = 2-5 ... 3-5. 

 G. = 4-4 ... 4-8. 



Grey Manganese. J. ii. 419. 



Allamte. iii. 68. 



Brookite. iii. 82. 



Fergusonite. iii. 98. 



Orthite. iii. 133. 



Phosphate of Manganese. Chem. iii. 136. 



Stilpnosidcrite. iii. 158. 



YUro-TantaUtc. J. iii. 173. 



IX. ORDER. METAL. 



/ 



I. ARSENIC, Form unknown. 

 Colour tin-white. 

 H. = 3-5. 

 G. = 5-7 ... 5-8. 



1 . - N AT i VE. Reniform, massive. 



Arsenic. " 423. 



