Pulaskite. Greenland.

This is a thin section microscope slide of a Pulaskite from Ilimaussaq, Greenland. The donor of this sample, to whom I am most grateful for this and other exceptionally rare rock samples, describes this as representing the least evolved rocks in the Ilimaussaq intrusion, and possible the parental magma from which the other rocks in the intrusion evolved. This sample shows aegirine and ardfedsonite, some unidentified mineral with radiating acicular form and light microcline in a feldspathoid matrix, nepheline and others. The microcline has a most unusual mosaic like twinning.
1 Slide

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