.22 



The right hand figure shows these marks more faintly like 

 the original with the marks of the fracture parallel to the 

 edges — see the figure le?ieath, which, if carried regularly on 

 every edge, would produce the rhomboidal dodeeaedron, 

 one of the characters of Blend. The gangue is mostly 

 Copper Pyrites. 



Since figuring this specimen I have met with a finer one 

 from Cornwall with smaller distinct cubic crystals, or 

 rather separate ones, much resembling Pyrites : the diagonal 

 strise however help to detect it, they are nearly gold-co- 

 loured^ and iridescent externally, but dark like Blend within. 



