gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1960.032.248.04 An X-ray Study of Exsolution Phenomena in the Skaergaard Pyroxenes Bown M. G. M.A., Ph.D. Dept. of Geology and Mineralogy, Oxford University, Gay P. M.A., Ph.D. Dept. of Mineralogy and Petrology, Gambridge University. 3 1960 32 248 379 388 Copyright © 1960, The Mineralogical Society 1960 Summary

The single crystal X-ray methods for the study of exsolution phenomena in pyroxenes previously described by the authors have been applied to the pyroxenes of the Skaergaard intrusion. The results for about fifty pyroxene crystals, selected from various levels between the chilled margin and a height of 2600 metres in the layered series, are presented and are correlated with previous optical descriptions. Whilst the correlation between the results of the optical and X-ray examinations is in general satisfactory, the present investigation shows that the X-ray techniques can in some cases extend our knowledge of the Skaergaard pyroxenes.