I.—On the Zeolites and Associated Minerals from the Tertiary Lavas around Ben More, Mull

Abstract

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. B. 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 inaccessible localities.