gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1988.052.368.21 Mineralogical Note Mercury and Silver-Bismuth Selenides at Alva, Scotland Parnell John Department of Geology, Queen's University, Belfast BT7 1NN, UK 12 1988 52 368 719 720 21 12 1987 11 2 1988 Copyright © 1988, The Mineralogical Society 1988 Keywords tiemannite mercury selenium silver bismuth bitumen Scotland