GONNARDITE FROM AN ALKALINE SYENITE PEGMATITE AT ALLT A' MHUILLIN QUARRY, ASSYNT, SUTHERLAND, SCOTLAND

摘要

Since its original description in 1896, gonnardite has had a difficult history. Its tendency to be intergrown with other zeolites, particularly the closely related natrolite and thomsonite, has hampered detailed characterisation. Further confusion has arisen from the use of the names ranite and tetranatrolite to describe material no w regarded as gonnardite. Artioli and Galli (1999) clarified matters considerably with a review of the literature, and a re-examination of type material. They concluded that gonnardite has a disordered natrolite structure, its variable composition is intermediate