MODE II. KERALITE. 153 



STRUCTURE III. LAMINAR. 



This is generally dull, and approaches to the 

 next Mode, keralite, or rock-flint. The layers are 

 commonly thin, that is, from a quarter of an inch 

 to an inch. It forms a hill near Bamf. Saussure, 

 1483, has described a black schistose quartz, 

 which may be a siliceous schistus of the Ger- 

 mans. 



The cellular, stalactitic, fibrous, and other struc- 

 tures, seem to occur only in small portions, and 

 rather belong to lithology or gemmology. 



MODE II. KERALITE, OR ROCK-FLINT. 



Texture, compact and uniform, but sometimes characters, 

 laminar. 



Hardness, crystallic. Fracture, splintery, con- 

 choidal : the scaly fracture distinguishes it from 

 flint. Fragments, sharp. 



Weight, granitose; sometimes, but rarely, car- 

 bonose. 



Lustre, dull. Opake; but often translucent 

 on the edges. 



Colour, grey, black, green, &c. 



It composes entire mountains. 



This rock is the hornstdn of the Germans, 



