gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1967.036.279.05 A Note on the Occurrence of Potassium-Rich Trachytes in the Kaiserstuhl Carbonatite Complex, West Germany Sutherland D. S. B.Sc., Ph.D., L.R.I.C., F.G.S. Department of Geology, The University, Leicester 9 1967 36 279 334 341 4 2 1967 Copyright © 1967, The Mineralogical Society 1967 Summary

Specimens of trachyte obtained on a recent visit to the Kaiserstuhl are compared with similar potassium-rich rocks from carbonatite complexes in Africa. Two new chemical analyses are given, in which the values for alkalis (Na2O 1·21, K2O 12·63; Na2O 0·92, K2O 12·18 %) are of interest.