the Granite of the Dublin and Wicklow Mountains. 43 



Lough Dan, County Wickloiv. 



99-53 

 Specific gravity = 2-559. 



Glenmacanass, County Wicklow. 



SiO 3 . 



A1 2 3 



MgO . 



CaO . 



KO . 



NaO . 



Loss by ignition 



Per cent. 



6419 



18-39 

 0-34 

 0-70 



11-39 

 2-95 

 0-58 



98-54 



Atomic quotients. 

 1-417 

 0-358 

 0-0171 

 0-025 I 

 0-242 f U d7y 

 0-095 J 



Proportionals. 

 3-96 

 1-00 



1-05 



Specific gravity = 2-553. 

 Glendalough, County Wicklow. 



99-69 



Specific gravity = 2-453. 

 Glenmalur, County Dublin. 



98-70 

 Specific gravity = 2500. 



