Kin ah an — On Irish Marbles and Limestones. 399 



have raised some fair-sized blocks ; colour white, tinted with grey. 

 In the lake in White Island there is a very peculiar stone, white, 

 spotted with green Serpentine crystals. This rock is associated 

 with green ophialyte ; no opening has as yet been made in it. 



South of Adrehid Lake, and in a second place, to the westward 

 of Glengowla Mine, both a little west of Oughterard, there are 

 white crystalline rocks, that have not been tried as yet. 



There is also an untried fair-looking white limestone north-west 

 of Ross Lake, between Oughterard and Gralway. 



Louth. 



In the Carlingford promontory white crystalline limestones 

 have been found in three places, but of such limited extent, that it 

 seems improbable that they should ever be of commercial value. 



SIENNA-COLOURED. 



Donegal. 



In Glendowan, westward of Lough Yeagh, M ( Henry records a 

 ribanded Sienna-coloured stone, that polishes well, but it is too 

 thin-bedded to be of much value. Its layer there is a structure 

 like Eozoon canadense. 



GaLWAY. 



At Lough Auna there is a maculated Sienna-coloured stone of 

 limited extent (see page 402). 



BLACK MARBLE. 



[Black stones in the metamorphic rocks fit for marbles are only recorded in the 

 Cos. Donegal and Londonderry.] 



Donegal. 



At Kintale, a mile and a-half north of Eathmullen, Kane 

 records a stone capable of being used as a marble. It appears to 

 be only very locally known. 



Londonderry. 



At Carricksheedy there is a black stone capable of taking a 

 good polish; it appears, however, to be only locally known. 



