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Localities of Minerals in Antrim. 



Albite is found in distinct crystals, imbedded in greenstone por- 

 phyry at Ballycastle. 



Analcime is common in the cavities of the trap and basaltic rocks, 

 as at the Giant's Causeway; in small transparent crystals; at Dunluce 

 Castle ; O'Hara's Bocks, near Port Stewart, where it is plentiful, lining 

 fissures, and forming nodules in amygdaloid. It is studded with pyra- 

 midal crystals of yellow Calcite at Glenarm ; at Doon Point, in Eathlin 

 Isle, in fine white translucent crystals with Mesotype (see also, under 

 Faroelite and Gmelinite). Plentiful at Layd, at Tickmacrevan, and at 

 Deer Park, Glenarm. 



Antrimolite is found at Ballintoy, snowy white, investing pyrami- 

 dal crystals of yellow, Calcite or disposed on Chabasite, in the cavities of 

 amygdaloid ; sometimes studded with rhombs of brown Calcite. It is 

 found at Bengore Head, and also at the Causeway, in a simliar rock 

 (see also Arragonite.) 



Apatite occurs, yellowish white, in doubly- terminated six-sided 

 prisms, in a basaltic dyke near Kilroot. 



Apophyllite occurs at Ballinto)^ in soft wacke, in four-sided pyramids, 

 sometimes truncated, of a yellowish white or greenish colour, disposed 

 on Stilbite ; at Portrush, in small, perfectly transparent crystals of the 

 primary form, with Mesole, in cavities of the augitic rock ; also in large 

 crystals, white or slightly translucent, near Portrush ; at Agnew's 

 Hill, five miles west of Larne, in forms similar to those met with at 

 Portrush ; also at Island Magee. 



Arragonite occurs at Ballintoy, associated with Antrimolite, of a fine 

 oil green colour, radiated ; occasionally at Portrush, and at the Giant's 

 Causeway. 



Augite occurs in large distinct crystals of black and greenish-black 

 colour, in the cavities of the black augitic rock at Portrush, coated by 

 and associated with Mesole, also at Pair Head; at Agnew's-hill, near 

 Larne; at Tor Head, Cushendun (see also Olivine). 



Brewsterite is found coating cavities in amygdaloidal rocks at the 

 Giant's Causeway. 



Calcite is found at Ballintoy, with Antrimolite, and at the Giant's 

 Causeway, of a rich honey-yellow, or orange colour, highly translucent, 

 sometimes locally called sugar-candy; at Tickmacrevan, in large crys- 

 talline masses, in chalk, often replacing and taking the form of the 

 flints ; at Portstewart, in aggregated rhombohedral crystals, with a pe- 

 culiar oily lustre (see also under A nalcime, Chabasite, JVatrolite). Through- 

 out the trap districts of Ireland, veins of Calcite, generally of a yellow 

 colour, are common. 



Chabasite. — This mineral occurs at the Causeway, along with Stil- 

 bite, in fine white translucent crystals, and in amygdaloid at Ballintoy, 

 (see also Antrimolite, Rhodolite). The best specimensfrom Portrush are 

 of considerable size and transparent ; near the Ball, in Eathlin Island, 

 with crystals of Calc-spar ; at Island Magee, near Larne, of a light-red 



