122 



TRANSACTIONS OF THE 



THIRD CLASS — MINERALS. 



All those with metallic lustre, and which have G, from 

 3, 2 to 22, belong here without exception. 



Those with common lustre ; H. from i to 9 ; and G. 

 from 2, 2 to 8, 5, belong under the following con- 

 ditions : 



If H, from \ to 2| : and G. from 2, 2 to 8, 5; yet, 

 When G. from 2, 2 to 3, 4, and color and 

 streak black, or deep yellow. 

 G. from 3, 5 to 8, 5, and color and 

 streak black, brownish red, 

 or yellow. 



If H. from %\ to 6 5 G. from 2, 3 to 8, 5, and 

 color red, streak red or yellow, or color 

 and streak black, brown or yellow : also, 

 when being H. from 4§ to 5 j, they are 

 cleavable in dodocahedrons, with colored 

 streak or not. If H. from 5 to 6, and 

 also gray streaked. 



If H. from 6 to 7 5 G. from 3, 5, to 8, 8, color 

 black and brown streak dark gray, black, 

 brown and yellow, or G. not less than 4. 



If H. from 7 to 9 ; and G. from 3, 9 to 8, 5 ; 



If G. from 3 ? 9 to 4, and they have prismatic 

 cleavage, not tesseral. 



