Kakortokite

Kakortokite: a variety of agpaitic nepheline syenite displaying pronounced cumulate textures and igneous layering with a repetition of layers enriched in alkali feldspar, eudialyte and arfvedsonite. From Kakortok (now Qaqortoq), Ilímaussaq, Greenland; Ussing, 1912

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

Sample kindly given to me by Robert Gill.

ilimaussaq2017(6).jpg

The layered kakortokites from north slopes of Kangerdluarssuk.

Panoramic view of a kakortokite. Image by Andy Tindle (Virtual Microscope). PPL image, field of view = 2.5cm. See also kakortokite - Virtual Microscope for more information on kakortokite.

Panoramic view of a kakortokite. Image by Andy Tindle (Virtual Microscope). XPL image, field of view = 2.5cm. See also kakortokite - Virtual Microscope for more information on kakortokite.

Bibliography

• G.Markl; M.Marks; G.Schwinn e H.Sommer (2001): Phase Equilibrium Constraints on Intensive Crystallization Parameters of the Ilímaussaq Complex, South Greenland. Journal of Petrology. Num.12; vol. 42; pg: 2231–2258.
• S. Karup-Møller; J. Rose-Hansen (2013): New data on eudialyte decomposition minerals from kakortokites and associated pegmatites of the Ilimaussaq complex, South Greenland. In: Geological Society of Denmark. Bulletin, Vol. 61, 2013, p. 47-70.

Photo
Arfvedsonite crystals in a kakortokite. Ilímaussaq, Greenland. PPL image, 2x (Field of view = 7mm)	Arfvedsonite crystals in a kakortokite. Ilímaussaq, Greenland. XPL image, 2x (Field of view = 7mm)	Arfvedsonite and alkali feldspar crystals in a kakortokite. Ilímaussaq, Greenland. PPL image, 2x (Field of view = 7mm)
Arfvedsonite and alkali feldspar crystals in a kakortokite. Ilímaussaq, Greenland. XPL image, 2x (Field of view = 7mm)	Arfvedsonite and alkali feldspar crystals in a kakortokite. Ilímaussaq, Greenland. PPL image, 2x (Field of view = 7mm)	Arfvedsonite and alkali feldspar crystals in a kakortokite. Ilímaussaq, Greenland. XPL image, 2x (Field of view = 7mm)
Arfvedsonite, alkali feldspar and eudyalite (Eud label) crystals in a kakortokite. Ilímaussaq, Greenland. PPL image, 2x (Field of view = 7mm)	Arfvedsonite, alkali feldspar and eudyalite (gray) crystals in a kakortokite. Ilímaussaq, Greenland. XPL image, 2x (Field of view = 7mm)	Arfvedsonite and alkali feldspar crystals in a kakortokite. Ilímaussaq, Greenland. XPL image, 2x (Field of view = 7mm)
Arfvedsonite and alkali feldspar crystals in a kakortokite. Ilímaussaq, Greenland. XPL image, 2x (Field of view = 7mm)	Eudyalite crystals with arfvedsonite inclusions in a kakortokite. Ilímaussaq, Greenland. PPL image, 2x (Field of view = 7mm)	Arfvedsonite and alkali feldspar crystals in a kakortokite. Ilímaussaq, Greenland. XPL image, 2x (Field of view = 7mm)
Arfvedsonite crystals in a kakortokite. Ilímaussaq, Greenland. XPL image, 2x (Field of view = 7mm)	Arfvedsonite crystals in a kakortokite. Ilímaussaq, Greenland. PPL image, 2x (Field of view = 7mm)	Arfvedsonite and eudyalite (Eud label) crystals in a kakortokite. Ilímaussaq, Greenland. PPL image, 2x (Field of view = 7mm)
Arfvedsonite and eudyalite (gray) crystals in a kakortokite. Ilímaussaq, Greenland. XPL image, 2x (Field of view = 7mm)	Arfvedsonite and alkali feldspar crystals in a kakortokite. Ilímaussaq, Greenland. PPL image, 2x (Field of view = 7mm)	Arfvedsonite and alkali feldspar crystals in a kakortokite. Ilímaussaq, Greenland. XPL image, 2x (Field of view = 7mm)
Arfvedsonite, alkali feldspar and eudyalite (Eud label) crystals in a kakortokite. Ilímaussaq, Greenland. PPL image, 2x (Field of view = 7mm)	Arfvedsonite, alkali feldspar and eudyalite (gray) crystals in a kakortokite. Ilímaussaq, Greenland. XPL image, 2x (Field of view = 7mm)	Arfvedsonite and alkali feldspar crystals in a kakortokite. Ilímaussaq, Greenland. PPL image, 2x (Field of view = 7mm)
Arfvedsonite and alkali feldspar crystals in a kakortokite. Ilímaussaq, Greenland. PPL image, 2x (Field of view = 7mm)	Arfvedsonite and alkali feldspar crystals in a kakortokite. Ilímaussaq, Greenland. XPL image, 2x (Field of view = 7mm)	Arfvedsonite and alkali feldspar crystals in a kakortokite. Ilímaussaq, Greenland. XPL image, 2x (Field of view = 7mm)
Arfvedsonite, alkali feldspar and eudyalite (Eud label) crystals in a kakortokite. Ilímaussaq, Greenland. PPL image, 2x (Field of view = 7mm)	Arfvedsonite, alkali feldspar and eudyalite (gray) crystals in a kakortokite. Ilímaussaq, Greenland. XPL image, 2x (Field of view = 7mm)	Arfvedsonite and alkali feldspar crystals in a kakortokite. Ilímaussaq, Greenland. PPL image, 2x (Field of view = 7mm)