Vuonnemite : Na11Ti4+Nb2(Si2O7)2(PO4)2O3(F,OH)

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Copyright © OT. Ljostad
minID: X3H-0L0

Vuonnemite : Na11Ti4+Nb2(Si2O7)2(PO4)2O3(F,OH)

Copyright © OT. Ljostad  - This image is copyrighted. Unauthorized reproduction prohibited.

A 0,6 mm group of rare, yellowish, platy vuonnemite crystals. It was originally embedded in villiaumite which was removed by soaking the specimen in water. Kvanefjeld tunnel is the second locality for vuonnemite in Greenland.

See: Rønsbo, J. G., Lenonardsen, E. S., Petersen, O. V. & Johnsen, O.: Second occurrence of vuonnemite: the Ilímaussaq alkaline intrusion, South Greenland. – N. Jb. Miner. Mh. H 10, 451 – 460, Stuttgart 1983.

Vuonnemite from Kvanefjeld was first identified in one small sample from the exploration drift on the southern flanks of the Kvanefjeld plateau in the north-westernmost part of the intrusion: It was brought to the Geological Museum in Copenhagen by a private Danish collector, T. Weidner. All the vuonnemite samples originate from the transition zone between the two nepheline syenites named M-C lujavrite (M-C for medium- to coarsegrained) and black luvjarite and from the black luvjarite in the first 200 m of the adit. My vuonnemite comes from the black luvjarite. The identity of my vounnemite is verified by SEM/EDS by Tomas Husdal. The specimen was collected by the Danish collector Åse Mikkelsen around 1984. It is now in the micromount collection of OT. Ljøstad.

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Photo added:11th Nov 2008
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