74 
give an idea of the manner in which they lie. The darker 
sides of the prisms with the Pyrites * are chiefly primitives. 
The broader white + faces are truncations, as it were, of 
these, and have little irregular cavities with somewhat stel- 
lated Carbonate of Copper. On some sides there are minute, 
bright, iridescently golden-tinged, rust-coloured rhombs of 
Carbonate of Lime, which Count de Bournon took notice 
of in my museum when admiring the specimen. There are 
also darker ones passing to dark brown, and nearly or quite 
black. Some very pale Amethystine Quartz is occasionally 
found in the interstices, which sometimes has the im- 
pression of the Barytes. ; 
The faces in this specimen are best to be understood by 
the geometrical figure. : 
Since writing the above I have met with a specimen in 
which an interrupted crystal about six inches long lies 
partly imbedded in the gangue of the same, and ts of a 
very fine strong bright vinegar colour, but so well relieved 
as to appear equally bright; if not brighter, than the finest 
jewel set on foil. 
* The Pyrites, which is generally of a brassy yellow, was found from the 
octaédron to the cubo-octaédron in much variety, elegantly embossing the 
faces. 
+ The opaque whiteness of the faces seems to be a crystallization with a 
smaller propoftion of the water or solvent. 
