gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1960.032.248.05 A Note on a Nordmarkite and an Associated Rare-Earth Mineral from the Ben Loyal Syenite Complex, Sutherlandshire von Knorring O. Ph.D. Dearnley R. Ph.D. 1 Dept. of Geology, University of Leeds.

Present address: Geological Survey and Museum, Exhibition Road, London, S.W.7. Taken as read 5 November 1959.

 3 1960 32 248 389 391 Copyright © 1960, The Mineralogical Society 1960 Summary

A nordmarkite from the Ben Loyal syenite complex has been analysed, in which a powdery yellow mineral occurs in miarolitic cavities. The mineral may be a new hydrated species with a monazite structure and a chemical composition essentially that of monazite but with silicon partly replacing phosphorus and with magnesium, calcium, and iron partly replacing the rare earths.