Blue cancrinite from South-East Greenland

Abstract

Blue cancrinite intergrown with sodalite and albite has been found in nepheline syenite dykes in the Precambrian of South-East Greenland. Cabochons cut of the material show a blue colour with more or less pronounced aventurescence. Electron microprobe analysis and X-ray investigation have been carried out to establish the position in the cancrinite-vishnevite solid solution series. Trace elements have been determined by spectral analysis of the Greenland cancrinite as well as cancrinite from Litchfield Maine, USA and Bancroft. Ontario, Canada.