90 



although the fracture much resembles that of Quartz, but 

 is somewhat rougher. We admire the Count de Bournon's 

 indefatigable patience in measuring and pointing out the 

 modification of these crystals, which we did not attempt j 

 we have only ventured to point out a few faces that were 

 passed over, as they may possibly be somewhat interesting; 

 for which reason we have made sketches of them. The 

 bases seem exactly as the Count has determined them. 

 The principal are 3 small ones on the summit, as represented 

 Jig. 2.- — Fig. 4. shows a minute triangular one, and one of 

 those above mentioned. The matrix is ferriferous Car- 

 bonate of Lime with Pyrites and small double-pointed 

 crystals of Quartz. 



Flos-ferri and Arragon Spar of old authors belong to this 

 variety. 



