NJG54-4-01
1974
An occurrence of vein palygorskite from the nephelin syenite at Lillebugt, Stjernøy, northern Norway
54
4
329-336

Palygorskite and a montmorillonitic clay mineral occur in mountain leatherlike aggregates within fractures cutting nepheline syenite. The veins are part of a late hydrothermal-metamorphic suite but the age of the palygorskite is uncertain. It may have formed as the youngest phase of a hydrothermal assemblage developed under waning conditions of metamorphism or may be completely post-tectonic in origin and related to near-surface ground water circulation.

0029-196X
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