56 TIREY. MINERALS. 



found in the pink marble, the crystals being minute, 

 rare, and not easily discovered*. 



* It has been said that corundum was formerly found in Tirey, but 

 no specimens of it have been produced. As the several varieties of 

 pyroxene, with the exception of the coccolite imbedded in the pink 

 marble, had then been overlooked, it is not unlikely that some of these 

 have been mistaken for this substance. It appears also that the blue 

 variety of sahlite has been recently mistaken for hauyne. 



