186 



Besides this there are yellow spiculated tubes, almost 

 crystallized, radiating, 8cc. These are to be seen as form- 

 ing over wire-shaped Pyrites; see Brit. Min. tab. 162. 

 This has decomposed in some parts, leaving the hollow 

 where it has been with enough to show the appearance of a 

 wire, as the fracture in some parts on the opposite side 

 shows ; perhaps it may be between Eisen Keisel, or the 

 German Iron Flint, and Carnelian. Some gray Cachalon 

 covers the Carnelian in the hollow as represented at the 

 top of the figure. The yellower Quartz seems to be coloured 

 by yellow oxide of Iron, probably the decomposed Pyrites. 



