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

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
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)	Sodalite crystal (isotropic), rosenbuschite, arfvedsonite and alkali feldspar crystals (I order gray) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 2x (Field of view = 7mm)	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)
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)	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)	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)
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)	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)	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)
Arfvedsonite (green) and naujakasite (colorless square/rectangular crystals) in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)	Arfvedsonite and naujakasite (untwinned square/rectangular crystals, with I order gray colors) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 10x (Field of view = 2mm)	Arfvedsonite (green) and naujakasite (colorless square/rectangular crystals) in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)
Arfvedsonite and naujakasite (untwinned square/rectangular crystals, with I order gray colors) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 10x (Field of view = 2mm)	Arfvedsonite (green) and naujakasite (colorless square/rectangular crystals) in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)	Arfvedsonite and naujakasite (untwinned square/rectangular crystals, with I order gray colors) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 10x (Field of view = 2mm)
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)	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)	Arfvedsonite (green) and naujakasite (colorless square/rectangular crystals) in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)
Arfvedsonite and naujakasite (untwinned square/rectangular crystals, with I order gray colors) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 10x (Field of view = 2mm)	Arfvedsonite (green) and naujakasite (colorless square/rectangular crystals) in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)	Arfvedsonite and naujakasite (untwinned square/rectangular crystals, with I order gray colors) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 10x (Field of view = 2mm)
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)	Arfvedsonite (green) and naujakasite (colorless square/rectangular crystals) in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)	Arfvedsonite and naujakasite (untwinned square/rectangular crystals, with I order gray colors) in a Lujavrite. Ilímaussaq, Greenland. XPL image, 10x (Field of view = 2mm)
Arfvedsonite (green), rosembuschite (ligth brown esagonal sections) and naujakasite (colorless) crystals in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)	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)	Arfvedsonite (green), rosembuschite (ligth brown) and naujakasite (colorless) crystals in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)
Arfvedsonite (green), rosembuschite (ligth brown) and naujakasite (colorless) crystals in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)	Arfvedsonite (green), rosembuschite (ligth brown) and naujakasite (colorless) crystals in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)	Arfvedsonite (green), rosembuschite (ligth brown) and naujakasite (colorless) crystals in a Lujavrite. Ilímaussaq, Greenland. PPL image, 10x (Field of view = 2mm)
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)