Kakortokite  (a mixture of several minerals)
Current inventory:  0 gems
 

  
Kakortokite's name is derived from Qaqortoq, a town in the Kujalleq municipality in southern Greenland near where the material is found. The name "Qaqortoq" is western Greenlandic meaning "(the) white one".

Discovery date unknown;   IMA status: Not Valid (a trade name)

Chemistry

Chemical Formula:

A mixture of the minerals Nepheline syenite (white), Arfvedsonite (black) and Eudialyte (red) and possibly also occassionally Sodalite and Rinkite.

Optical Properties

Color:

Varying mixtures of white to off-white, red and black.

Transparency:

Opaque

Luster:

Vitreous

Occurances

Geological Setting:

In hydrothermal veins cutting nepheline syenite and syenite (Ilímaussaq Intrusion, Greenland). Characteristic of alkalic rocks as nepheline syenites and gneisses, alkalic gabbros; in sodium-rich hypabyssal rocks, tufts and lavas, and pegmatites; as a product of sodium metasomatism.

Common Associations:

Arfvedsonite, Chkalovite, Eudialyte, Nepheline, Rinkite, Sodalite, Tugtupite

Common Impurities:

n/a

Type Locality:

Kangerdluarssaq Fjord (Kangerdluarsuk Fjord), Qaqortoq (Julianehåb), Narsaq, Kitaa Province (West Greenland), Greenland

Year Discovered:

Unknown

More Information

n/a

Kakortokite is a rare intrusive igneous rock composed of a mixture of varying amounts of Nepheline syenite (white), Arfvedsonite (black) and Eudialyte (red). It is found in outcrops high on the walls of cliffs on the southern side of the eastern end of Kangerdluarssaq Fjord (also spelled Kangerdluarsuk Fjord) in far-southern Greenland. The outcrops are about 700 meters above the fjord and must be backpacked down a very treacherous path. Limited quantities are available due to the inaccessibility of the area.

Kakortokite's name is derived from Qaqortoq, a town in the Kujalleq municipality in southern Greenland near where the material is found. The name "Qaqortoq" is western Greenlandic and means "(the) white one".
 

  
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