of the Counties of Down, Antrim, and Deny. 85 



Basaltic Hornblende. — Occurs in lamellar masses at, Fairhead and other 

 places. 



Slaty Hornblende. — Subordinate to primary Rocks in many places. 



Kirwanite. — Found by Mr. P. Doran in the Greenstone and Porphyry of 

 Mourne, and named by Dr. Thomson. It occurs in radiated concretions 

 of a dark-green colour, and consists of silica, protoxide of iron, lime, 

 alumina, and water. 



Asbestous Tremolite. — In Mourne : Grauwacke\ 



Olivine and Augite. — Occur frequently in Trap Rocks. 



Common Schorl. — Is found in the Mica Slate of Antrim and Derry ; also in 

 the Mourne Granite. 



Tourmaline. — In the Mourne Mountains, in various forms ; Giesecke. 



Friable Zoisite. — Of a dirty white colour. It occurs in J light-gray decom- 

 posing Clay Slate near Annalong, Mourne. First noticed by Mr. P. 

 Doran. 



Common Garnet. — In small dodecahedrons, of a reddish-brown colour, in 

 the Derry Mica Slate. 



Precious Garnet. — In small dodecahedrons, of a red colour, in the Mourne 

 Granite; Giesecke. 



Natrolite, Scolezite, Mesolite, Stilbite, Heulandite, Analcime, and Chabasite. 

 — Occur more or less frequently in all our Traps. Sir C. Giesecke 

 thinks the analcime rare in our trap rocks. I have found it very com- 

 mon. Stilbite occurs also in Mourne Granite, of a white colour and 

 bright pearly lustre. 



Laumonite. — Discovered in four-sided prisms, of a pure white colour, in the 

 Mourne Granite, by Mr. P. Doran. Sir C. Giesecke found it at Down- 

 hill, in Trap. 



Thomsonite. — 1 found what Dr. Thomson pronounced to be a new variety 

 of this mineral in Greenstone near Ballymoney, Antrim. 



Hydrolite and Leveyne. — Discovered in the Amygdaloid of Little Deer 

 Park, Glenarm, by Mr. P. Doran. They are fully described by Dr. 

 Thomson, in the Transactions of the Royal Society of Edinburgh, vol. XI. 

 part ii. 



Antrimolite. — This mineral has been analysed and named by Dr. Thomson. 

 It consists of silica, alumina, lime, and potash, and a large proportion 

 of water. It occurs in cylindrical and conical masses, having an axis of 

 calcareous spar, from which it is radiated, and resembles much the com- 

 mon fibrous mesotype. Sp. gr. 2-09. 



Lehuntite. — Occurs massive, of a yellowish-white colour: constituents, silica, 

 alumina, soda, and water. Sp. gr. 1*9. It was found at Carncastle near 

 Glenarm, by Mr. P. Doran ; analysed by Dr. Thomson, and named in 

 honour of Captain Lehunt. 



Harringtonite. — This mineral occurs massive, of a snow-white colour : con- 

 stituents, silica, alumina, water, lime, and soda : found at Portrush, by 

 Mr. P. Doran ; analysed by Dr. Thomson, and named in honour of a 

 friend in Dublin. 



Mesole. — At Downhill, in Amygdaloid ; Giesecke. 



Erinite. — Occurs in small detached pieces, of a green colour, in a Steatitic 

 Greenstone. It consists of silica, water, alumina, and protoxide of iron. 

 It was found by Mr. P. Doran at Dunseveiic, under high-water mark ; 

 — from this circumstance the analysis gave a trace of common salt. 



Phillipsite. — Of a yellowish colour, and in variously modified rhomboids, 

 has been recently found in Amygdaloid in Island Magee, by Mr. P. 

 Doran. 



Chalilite. — A mineral very recently found by Mr. P. Doran in the Por- 

 phyry of Sandy Brae; and named by Dr. Thomson, from its resemblance 



