102 ON THE MINERALOGY OF THE 



The wavellite is likewise associated in these con- 

 temporaneous veins, with common white quartz. In 

 one mass, which I obtained from a cottager in the 

 neighbourhood, and which weighs upwards of nine 

 pounds, the quartz and the wavellite occur in near- 

 ly equal proportions, indicating a simultaneous for- 

 mation. 



This mineral passes from nearly colourless, through 

 greenish-white to apple-green. In one specimen, I 

 observed it of a deep honey yellow. When exposed 

 to the weather, it loses its lustre, and decomposes 

 into a greyish-white powder. 



In the clay-slate, petrified shells are found, be- 

 longing to the genus orthocera. These, however, 

 are so much incorporated with the rock, that I could 

 not obtain characteristic specimens. They abound 

 in a quarry a little to the south and west of the 

 town of Cove of Cork. 



Viewing the characters of the rocks now enume- 

 rated in connection, I have little hesitation in re- 

 ferring them to the transition class. They occupy 

 a considerable portion of the south of Ireland. In 

 travelling from Cork to Dublin, the same rocks 

 present themselves throughout the greater part of 

 the journey. Between Mitchelstown and Cashel, 

 however, I observed numerous blocks of common 

 red sandstone conglomerate, with which the sum- 

 mits of the Galtec mountains appear to be caped. 

 But I must here stop, as I am aware the members 



