Kinahan — On Irish Marbles and Limestones. 411 



Associated with the long ophyte mass of the Croagh Patrick 

 range, there are steatytes of greater or less extent in different 

 places. 



Wicklow. 

 To the eastward of Croaghan Kinshella, in the townland 

 of Killahurla, there are in places dykes of a reddish or orange 

 friable steatyte. None of these have been opened in depth. 



PYROPHYLLYTE, or CAMSTONE. 



[Pale greyish-green to dark-green. When cut and polished some are of a rich 

 olive-green. They are only recorded in the Cos. Cork(?), Donegal, Galway(P), and 

 Wexford.] 



Cork. 

 In the carboniferous slate, to the south-west of Castletown 

 Berehaven, are beds or dykes of a pale-yellowish stone that are 

 probably pyrophyllyte or an allied rock ; they, however, require 

 further examination. 



Donegal. 



In this county camstone appears to have been recognized for 

 years, although in the records it has been called " a coarse or 

 impure kind of steatyte " ; and has even been mined and sent into 

 the market as steatyte. Years ago it was used for architectural 

 purposes, as in the ancient churches of Balleekan and Killydonnell 

 south and north, respectively, of the western arm of Lough Swilly, 

 where, when the Old Sandstone mullions of the windows decayed 

 away, they were replaced by new ones cut out of camstone. In 

 Balleekan there are also tombstones of a somewhat similar class of 

 rock. Where this stone was procured is now unknown. Wilkin- 

 son, writing in 1845, states that in the mountain range, near Kil- 

 macrennan and Barnagh are camstones that " can be cut or turned 

 with facility into any form," and "are very durable," but the loca- 

 lities are not given, and no quarries in this stone appear to have 

 been worked for years, or can now be pointed out in those neigh- 

 bourhoods. It is, however, known to ocour in the following 

 places : — 



About two miles N.N.W. of Castlefin, at Gibbstown, is a quarry 



