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TRANSACTIONS. 



I. — On the Zeolites and Associated Minerals from the Tertiary Lavas around 

 Ben More, Mull. By W. P. P. M'Lintock, B.Sc, Eoyal Scottish Museum, 

 Edinburgh. Communicated by J. S. Flett, D.Sc, LL.D., F.R.S. 



(MS. received May 17, 1915. Eead June 28, 1915. Issued separately September 23, 1915.) 



[Plates I-IIL] 



Introduction. 



The special features of interest attaching to the Tertiary igneous rocks of Mull 

 have been made known to geologists mainly through the classic descriptions of 

 Professor J. W. Judd and Sir Archibald Geikie. The point of view of these two 

 investigators is, however, essentially geological, and they refer but little to the 

 occurrence of minerals and rarely give precise localities. It is clear, too, that the 

 late Professor M. F. Heddle did not make an exhaustive examination of many 

 localities in Mull, for his collection in the Royal Scottish Museum contains very few 

 specimens from that island. With a view to filling up this gap I have paid several 

 visits to Mull, and this paper deals with some of the material which I collected. The 

 officers of the Geological Survey who are at present mapping the island have helped 

 me considerably with information and material ; and to Mr J. E. Richey, B.A., who 

 has surveyed the area from which a large part of the material was obtained, I am 

 particularly indebted for assistance in collecting specimens from somewhat in- 

 accessible localities. 



The rocks around Ben More exhibit several peculiar characters which have been 

 noted by Sir Archibald Geikie,* aud also by Professor Judd,! who gives a description 

 of their petrographical characters and altered state, and notes the presence in them 

 of veins and nests of green and pink epidote. Again, Mr James Currie has recorded! 



* Sir Archibald Geikie, The Ancient Volcanoes of Great Britain, 1897, vol. ii, pp. 184, 213. 



t J. W. Judd, "On the Propylites of the Western Isles of Scotland," Quart. Joum. Geol. Soc, 1890, vol. xlvi, 

 pp. 368, 363. 



+ James Currie, "The Minerals of the Tertiary Eruptive Rocks of Ben More, Mull," Tram. Eclin. Geol. Soc, 

 1898, vol. vii, p. 223. 



TRANS. ROY. SOC. EDIN., VOL. LI, PART I (NO. 1). 1 



