NEIGHBOURHOOD OF CORK. 



93 



In the same cavities are found crystals of quartz 

 intermixed with the brown-spar and the dolomite. 

 These are either short six-sided prisms, terminat- 

 ed by six planes, or simply six-sided pyramids. They 

 are middle-sized, and adhere to the rock on one side. 



In some of the larger druses, crystals of ame- 

 thyst have been found of considerable size and 

 beauty. Some of these have exceeded two inches 

 in diameter and four inches in length. In 'one 

 place, close by the marshy banks of the river, and 

 near the town, the best crystals have been found ; 

 but in consequence of a dispute between the King 

 and the proprietor of the soil, with respect to the 

 right of search, all access to the cavity is prevented. 



Returning again to the compact limestone, we 

 may observe, that besides the contemporaneous mass- 

 es of dolomite, it is traversed by numerous contem- 

 poraneous veins of calcareous-spar, and of massive 

 brown-spar. Both these are pure white, while the 

 rock in which they occur retains its usual grey colour. 

 These veins sometimes have a brecciated aspect, 

 containing portions of the rocks intermixed. In 

 one place I observed snow-white fine granular 

 limestone, in the form of a contemporaneous vein. 



The calcareous spar at a place called Ballanloch, 

 occurs in globular distinct concretions, from a few 

 inches to several yards in diameter. Each concre- 

 tion consists of numerous angular pieces, diverging 

 from the centre, and increasing in size to the cir- 

 cumference. In general, each large concretion con- 



