gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1990.054.374.09 Silicate Mineralogy A Potassium-Rich Zeolite in Soil Development on Danian Chalk Nørnberg P Department of Earth Sciences, University of Aarhus, DK-8000 Aarhus C. Denmark 3 1990 54 374 91 94 13 3 1989 22 5 1989 Copyright © 1990, The Mineralogical Society 1990 Abstract

A zeolite found in a soil profile developed in Danian chalk was studied. The results showed that it is a heulandite, temperature-stable to above 600°C with a Si/Al ratio of 2.88 and almost completely K-exchanged. The mineral probably formed under burial diagenetic conditions in the chalk formation.

 Keywords zeolite heulandite soil chalk Denmark