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colour ; also in bluish -white transparent crystals, in the cavities of a 

 ferruginous amygdaloid, at Sallagh Braes, near Larne ; in amygdaloid, 

 at Portstewart. 



Chalcedony is found on the coast near Ballycastle ; at Knocklayd ; 

 and on the shores of Lough Neagh (see also under Chlorophceite). 



Chlorophmite is found in thin crusts in Chalcedony in Antrim ; and 

 in small botryoidal groups in vesicular trap at Downhill. 



Chrysolite occurs in small crystals in the crystalline traps of the 

 Causeway ; they are occasionally observed all along the basaltic range. 



Cordierite is found in the Island of Rathlin. 



Dolomite. — At Ballygawn, three miles north-west of Ballygally 

 Head, below Larne, in Antrim. Here it appears to be altered chalk. 

 It is in contact with a large whin dyke. 



Doranite is found in basalt two miles west of Carrickfergus. 

 [ Epidote is got in veins at Fair Head, with quartz, fluor, and pink 

 felspar. It is granular, and forms veins in the hornblendic rock at 

 Tie veragh- hill, near Cushendall. 



Faroelite occurs in greenstone at Portrush; at Agnew's Hill, west 

 of Larne ; at the north-west of Rathlin Island, in distinct globules, 

 and in mamillary coatings, associated with transparent A nalcime, and 

 Mesolite, at Black Cave, near Larne (see Mesole). 



Felspar. — Varolite, a greenish to a darkish-green rock, containing 

 disseminated spherules, white or greenish- white, having the nature of 

 felspar, is found in this county. Rhyacolite, common in trachytic por- 

 phyry in distinct crystals, is also found. 



Gmelinite occurs at Portrush in large and nearly opaque crystals, of a 

 greenish-white colour ; but is not common there. At the Little Deerpark, 

 Glenarm, in greenstone, in very distinct and perfect crystals, white 

 and transparent. At Island Magee, where it is very common, in the 

 cavities of the trap rocks, the crystals are commonly small, but measure 

 occasionally half an inch across. In colour, they range from straw- 

 yellow to deep flesh-red, and vary from opaque to transparent. They 

 are often associated with small pinkish crystals of Phillipsite, and 

 with Mesotype and Analcime. At Larne Glen and Black Head, near 

 Larne, in large crystals, of a pale flesh-colour, and nearly transparent. 



Green earth is found in the trap and amygdaloidal rocks of Antrim. 

 It is common, lining the cavities in amygdaloid. 



Gypsum is found at Kilroot, near Carrickfergus, in large transparent 

 and aggregated crystals, over the salt bed at that place. Fibrous 

 Gypsum, or Satin Spar, occurs in the valley of the Porth, near Belfast. 



Harmatome is found in basalt at the Giant's Causeway. 



Harringtonite, or amorphous Mesolite, is found in veins half an inch 

 thick, in fine-grained greenstone, at Portrush and at the Skerries; 

 at Island Magee ; at Agnew's Hill, five miles west of Larne. 



Hematite, red, compact, fibrous and botryoidal, occurs in Bole, at 

 Ballintoy ; similarly at Rathlin Island. 



Reulandite occurs at Portrush, in cavities in greenstone, and in trap ; 

 at the Giant's Causeway, well crystallized ; at Ballintoy, with Stilbite ; 



B. I A. PROC. VOL. X. 2 X 



