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XIV. List of the Simple Minerals of the Counties of Down, 

 Antrim, and Deny. By James Biiyce, Jun.M.A.; Member 

 of the British Association for the Advancement of Science, 

 of the Geological Society of Dublin, of the Natural History 

 Society of Belfast, tyc* 

 TNa small work, entitled " Tables of Simple Minerals, 

 1 Rocks and Shells, with local Catalogues of Speciesf," pub- 

 lished by me about two years since, there was given a list 

 of the minerals found in the North of Ireland, — the list being 

 confined to the minerals of the three northern counties, the 

 productions of the others being but imperfectly known. Im- 

 pressed with the importance of making catalogues of local 

 productions more extensively known than they could be by 

 means of a work of the above kind, I avail myself of the ex- 

 tensive circulation of the Philosophical Magazine, to make 

 naturalists generally acquainted with the minerals of the North 

 of Ireland. 



Sir C. L.Giesecke has lately published an Irish Mineralogy, 

 appended to his descriptive Catalogue of the Royal Dublin 

 Society's Collection. The appearance of this work should be 

 hailed with pleasure by every one interested in promoting a 

 knowledge of the Natural History of Ireland. It is to be hoped 

 that it will speedily be followed by an Irish Flora, and an 

 Irish Fauna. It was not, however, to be expected that, in the 

 present state of our knowledge, a work of this kind could be 

 at all complete, although the indefatigable zeal and accom- 

 plished skill of Sir C. Giesecke have effected much. A chief 

 inducement to the publication of the present article is to sup- 

 ply some of the deficiencies in his Catalogue. In the follow- 

 ing list several species new to mineralogists will be observed. 

 These have been all analysed and named by Dr. Thomson, 

 who kindly permitted them to be published in the work above 

 referred to. An account of some of them has since been pub- 

 lished by him in the Edinburgh Transactions. For the dis- 

 covery of many of these new species we are indebted to the 

 active research of Mr. Patrick Doran, an intelligent mineral 

 dealer. 



Simple Minerals of Down, Antrim, and Deny. 



Common Quartz. — Very common everywhere; forms large veins in the 



Grauwacke of Down, and in the Mica Slate of Western Derry. 

 Rock Crystal. — Frequent in the Trap formations, in very large crystals in 



* Communicated by the Author. 



\ Belfast: Simms and M'Intyre; Longman and Co. London; John 

 Cumming, Dublin; Smith and Son, Glasgow. — [This work was noticed in 

 Phil. Mag. and Annals, N.S. vol. xi. p. 224.— Edit.] 



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