NarssÂrssuk

Thanks to O.V.Petersen for informations from his articles and to J.P.Frisch and especially Richard Schoeler, Kopenhagen, for specimens and informations.

The Igaliko nepheline syenite complex covers about 450 km², adjactent to the inland ice, the Tunulliarfik fjord and the Igaliku fjord. It consists of four major intrusions and several smaller stocks. Layering and lamination are common, the mineralogy is rather simple. Nearly all syenites (mostly foyaite) here are nepheline bearing.

Narssârssuk (or Narsarsuk, as it was formerly called in Danish) is a smaller pegmatite in the western part of the Igferfigssalik center, obviously related to a porphyritic microsyenite intrusion. There is a large number of pegmatite pockets - centimeters to more than a meter in diameter. A typical feature of Narssârssuk is an unusually high percentage of silicates and carbonates. In regard of the somewhat more limited number of minerals there seems to be quite a percentage of origonal descriptions.

As you know, I visited the locality in 2001 - fantastic - you sit practically on a dump of weathered syenite pegmatite amd just pick up piece after piece, hardly any hammering required. How fantastic must be the specimens, that still slumber deep down ! However, Narsarsuk will soon be protected. So if you want to collect there - hurry ! Oh yes, and do some exercising - it's a terrible climb up and even worse down !

The view from the ridge is absolutely fantastic - this one is towards Narsarsuaq, ato the right there is the glacier producing all the nice icebergs. Hey, and half the rocks in front are interesting (well, at least some of them).



Mineral list: (bold = type locality)

Aegirine/Acmite
Aenigmatite
Albite
Analcime
Ancylite-(Ce)
Arfvedsonite
Ashcroftine-(Y)
Astrophyllite
Barylite
Bastnaesite-(Ce)
Biotite
Calcite
Catapleiite
Cerussite
Cordylite-(Ce)
Elpidite
Epididymite
Epidote
Eudialyte
Eudidymite
Ferrohornblende
Fluorapatite (and F.-(Y))
Fluorite
Galena
Gaidonnayite
Goethite
Gonnardite
Graphite
Hematite
Hemimorphite
Ilmenite
Leifite
Lepidocrocite
Leucophanite
Leucosphenite
Lorenzenite
Magnetite
Microcline
Microlite
Narsarsukite
Natrolite
Neptunite
Nordstrandite
Orthoclase
Polylithionite
Pyrochlore
Pyrolusite
Quartz
Rhodochrosite
Riebeckite ( and var. Crocidolite)
Roentgenite-(Ce)
Smithsonite
Soda-orthoclase
Sphalerite
Spodiophyllite
Synchysite-(Ce)
Taenolite
Tetranatrolite
Xenotime-(Y)
Zircon
Just about 500 m from the main Narsarsuk locality is the Nanna Pegmatite
This is just a small outcrop, but already the co-type locality for micheelsenite and yielding the world's best nafertisite.


Mineral list: (bold = type locality)

Aegirine/Acmite
Astrophyllite
Analcime
Calcioancylite-(Ce)
Catapleiite
Fluorite
Galena
Gibbsite
Leucophanite
Micheelsenite
Microcline
Nafertisite
Natrolite
Orthoclase
Polylithionite
Sodalite
Todorokite

North Motzfeldt Centre

New literature describes a further Igaliko locality: the North Motzfeldt Centre. It is an intrusive igneous centre within the Igaliko complex, consisting of two major units. Rocks are peralkaline nepheline syenites. The minral list so far is short:
Mineral list:
lavenite
pyrochlore
rinkite-mosandrite

&Suggested reading:

Petersen,O.V., K.Secher: The minerals of Greenland, Mineralogical Record, 24(1993), 2, pp.37-47

McDonald, AM et al.: Micheelsenite, (Ca,Y)(3)Al(PO3OH,CO3)(CO3)(OH)(6)*12H(2)O, a new mineral from Mont Saint-Hilaire, Quebec, Canada and teh Nanna pegmatite, Narsaarsuup Qaava, South Greenland. NEUES JAHRBUCH FÜR MINERALOGIE-MONATSHEFTE, 8(2001), 337-351

Petersen, OV et al.: Nafertisite from the Nanna pegmatite, Narsaarsuup Qaava, South Greenland. NEUES JAHRBUCH FUER MINERALOGIE - MONATSHEFTE, 7(1999), 303-310

Finch, AA et al.: The petrology and petrogenesis of the North Motzfeldt Centre, Gardar Province, South Greenland. MINERALOGICAL MAGAZINE, 65(2001), 759-774


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