Naujakasite Lujavrite

Lujavrite: Melanocratic agpaitic variety of nepheline syenite rich in eudyalite, arfvedsonite and aegirine with perthitic alkali feldspar. A pronunced igneous lamination is characteristic, as is the abundance in minerals rich in incompatible elements such as ussingite, naujakasite, steenstrupine, rosenbuschite, villiaumite etc. The name come from Luijaur, now Lujavr-Urt, Lovozero complex, Kola, Russia.

For more information about the Ilímaussaq magmatic complex, see page: "Ilimaussaq"



luajvrite(analcime).jpg

Analcime-rich lujavrite. From Hunterian Museum Geology Collections




lujavrite(steenstrupine).jpg

Steenstrupine (dark, big crystals) in a lujavrite. From Friends of Minerals Forum.




luajvrite(villiaumite).jpg

Naujakasite-rich lujavrite. Arfvedsonite (black), villiaumite (red) and naujakasite (lozenge-shaped).




Sample kindly given to me by Andy Tindle (the Oper University)

Bibliography



• Sørensen, H. (Ed.). (2001). The Ilímaussaq alkaline complex, South Greenland: status of mineralogical research with new results (No. 301). Geological Survey of Denmark and Greenland, Ministry of Environment and Energy.
• Hunt, E. J., Finch, A. A., & Donaldson, C. H. (2017). Layering in peralkaline magmas, Ilímaussaq Complex, S Greenland. Lithos, 268, 1-15.


Photo
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Sodalite crystal (colorless and rich in inclusions), rosenbuschite (light brown) arfvedsonite (green) and alkali feldspar crystals (colorless) in a Lujavrite. Ilímaussaq, Greenland. PPL image, 2x (Field of view = 7mm)
lujavrite(50).jpg

Sodalite crystal (isotropic), rosenbuschite, arfvedsonite and alkali feldspar crystals (I order gray) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 2x (Field of view = 7mm)
lujavrite(49).jpg

Sodalite crystal (colorless and rich in inclusions), rosenbuschite (light brown), arfvedsonite (green), naujakasite (colorless) and alkali feldspar crystals (colorless) in a Lujavrite. Ilímaussaq, Greenland. PPL image, 2x (Field of view = 7mm)
lujavrite(52).jpg

Sodalite crystal (isotropic), rosenbuschite, arfvedsonite, naujakasite (square/rectangular crystals, with I order gray colors) and alkali feldspar crystals (I order gray) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 2x (Field of view = 7mm)
lujavrite(48).jpg

Rosenbuschite (light brown), arfvedsonite (green), naujakasite (colorless square/rectangular crystals) and alkali feldspar crystals (colorless) in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)
lujavrite(47).jpg

Rosenbuschite, arfvedsonite, naujakasite (untwinned square/rectangular crystals, with I order gray colors) and alkali feldspar crystals (colorless) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 10x (Field of view = 2mm)
lujavrite(46).jpg

Rosenbuschite, arfvedsonite, naujakasite (untwinned square/rectangular crystals, with I order gray colors) and alkali feldspar crystals (colorless) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 10x (Field of view = 2mm)
lujavrite(45).jpg

Rosenbuschite, arfvedsonite, naujakasite (untwinned square/rectangular crystals, with I order gray colors) and alkali feldspar crystals (colorless) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 10x (Field of view = 2mm)
lujavrite(44).jpg

Rosenbuschite, arfvedsonite, naujakasite (untwinned square/rectangular crystals, with I order gray colors) and alkali feldspar crystals (colorless) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 10x (Field of view = 2mm)
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Arfvedsonite (green) and naujakasite (colorless square/rectangular crystals) in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)
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Arfvedsonite and naujakasite (untwinned square/rectangular crystals, with I order gray colors) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 10x (Field of view = 2mm)
lujavrite(8).jpg

Arfvedsonite (green) and naujakasite (colorless square/rectangular crystals) in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)
lujavrite(9).jpg

Arfvedsonite and naujakasite (untwinned square/rectangular crystals, with I order gray colors) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 10x (Field of view = 2mm)
lujavrite(10).jpg

Arfvedsonite (green) and naujakasite (colorless square/rectangular crystals) in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)
lujavrite(11).jpg

Arfvedsonite and naujakasite (untwinned square/rectangular crystals, with I order gray colors) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 10x (Field of view = 2mm)
lujavrite(13).jpg

Sodalite (colorless, high relief), arfvedsonite (green), naujakasite (colorless) and alkali feldspar crystals (colorless) in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)
lujavrite(14).jpg

Sodalite (isotropic), arfvedsonite, naujakasite (untwinned square/rectangular crystals, with I order gray colors) and alkali feldspar crystals (twinned) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 10x (Field of view = 2mm)
lujavrite(15).jpg

Arfvedsonite (green) and naujakasite (colorless square/rectangular crystals) in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)
lujavrite(16).jpg

Arfvedsonite and naujakasite (untwinned square/rectangular crystals, with I order gray colors) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 10x (Field of view = 2mm)
lujavrite(20).jpg

Arfvedsonite (green) and naujakasite (colorless square/rectangular crystals) in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)
lujavrite(21).jpg

Arfvedsonite and naujakasite (untwinned square/rectangular crystals, with I order gray colors) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 10x (Field of view = 2mm)
lujavrite(21).jpg

Sodalite (isotropic), arfvedsonite, naujakasite (untwinned square/rectangular crystals, with I order gray colors) and alkali feldspar crystals (twinned) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 10x (Field of view = 2mm)
lujavrite(30).jpg

Arfvedsonite (green) and naujakasite (colorless square/rectangular crystals) in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)
lujavrite(31).jpg

Arfvedsonite and naujakasite (untwinned square/rectangular crystals, with I order gray colors) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 10x (Field of view = 2mm)
lujavrite(2).jpg

Arfvedsonite (green), rosembuschite (ligth brown esagonal sections) and naujakasite (colorless) crystals in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)
lujavrite(3).jpg

Arfvedsonite, rosembuschite and naujakasite (untwinned square/rectangular crystals, with I order gray colors) crystals in a Lujavrite. Ilímaussaq, Greenland. XPL image, 10x (Field of view = 2mm)
lujavrite(19).jpg

Arfvedsonite (green), rosembuschite (ligth brown) and naujakasite (colorless) crystals in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)
lujavrite(34).jpg

Arfvedsonite (green), rosembuschite (ligth brown) and naujakasite (colorless) crystals in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)
lujavrite(35).jpg

Arfvedsonite (green), rosembuschite (ligth brown) and naujakasite (colorless) crystals in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)
lujavrite(36).jpg

Arfvedsonite (green), rosembuschite (ligth brown) and naujakasite (colorless) crystals in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)
lujavrite(37).jpg

Arfvedsonite, rosembuschite and naujakasite (untwinned square/rectangular crystals, with I order gray colors) crystals in a Lujavrite. Ilímaussaq, Greenland. XPL image, 10x (Field of view = 2mm)