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File:Villiaumitic lujavrite, Illímaussaq Complex, Kvanefjeld GD.jpg

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Villiaumitic lujavrite (~1.75 cm across) from the Precambrian of Greenland.

This is a rare intrusive igneous rock with a bizarre name: villiaumitic lujavrite. The dark gray rock itself is lujavrite, a variety of nepheline syenite having amphibole, aegirine pyroxene, nepheline, and feldspar. The red spots in the rock are crystals of the the rare halide mineral villiaumite (NaF - sodium fluoride).

Geologic unit & age: Illímaussaq Complex (Illímaussaq Intrusion; Illímaussaq Alkaline Complex), late Mesoproterozoic, 1.16 Ga

Locality: Kvanefjeld, southern Greenland
Date
Source Villiaumitic lujavrite (Illímaussaq Complex, late Mesoproterozoic, 1.16 Ga; Kvanefjeld, southern Greenland) 4
Author James St. John
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15177146800. It was reviewed on 27 September 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

27 September 2014

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