Greenland: Eudialyte Kakortokite
Collection:
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Object

Fact sheet

Greenland: Eudialyte Kakortokite

Sample MTD05 collected by Michael T. Doel

Described as having tugtupite, polylithionite etc. River boulder.

Rotation 1 -

Rotation 2 - microcline K(AlSi3O8)

Rotation 3 - polylithionite KLi2Al(Si4O10)(F,OH)2

Rotation 4 - eudialyte Na15Ca6(Fe2+,Mn2+)3Zr3[Si25O73](O,OH,H2O)3(OH,Cl)2 , arfvedsonite and ?

Ilimaussaq is the type locality for eudialyte

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.

Additional images
  • width 5.5 cm
  • width 5.5 cm
  • Long wavelength UV
  • width 5.5 cm - pink is eudialyte
  • Long wavelength UV
Map
60.93528, -45.903625
Description:
Illimaussaq intrusion, Narsaq river, Kitaa Province, SW Greenland
Precision:
Moderate
About this collection

The Ilimaussaq alkaline complex is the type locality for agpaitic nepheline syenites and represents an enormous concentration of rare elements, notably Li, Be, Nb, Zr, REE, Y, Th and U. Around 220 mineral species have been identified. We can't identify all the minerals present in these samples. Email us at virtual-microscope@open.ac.uk if you can help.

Note we have recently expanded the collection to include other syenite complexes worldwide.

See also Alex Strekeisen's great website for more information on syenite complexes.

Sample details

Collection: Greenland
Type
igneous
Category
Alkaline Suite
Rock-forming mineral
eudialyte
arfvedsonite
microcline
polylithionite
Category guide  
Category Guide
Title
Refers to any word or phrase that appears in the individual rock names. Names are generally descriptive; they allow users to search for broad terms like ‘granite’ as well as more specific names such as ‘breccia’. However, the adjacent descriptions of the specimens captures a wider range of general words and phrases and is a more powerful search tool.
Description
Refers to any word or phrase that appears anywhere in the descriptions of the specimens
Accessory minerals
Minerals that occur in very low abundance in a rock. They are usually not visible with the naked eye and contribute perhapssver, they often dominate the rare elements such as platinum group metals.
Rock-forming minerals
Minerals that make up the bulk of all rock samples and are also the ones used in rock classi?cation.
Timescale
Selecting one or more period, for example 'Jurassic'.
Theme
A term used to group together related samples that are not already gathered into a single Collection. For instance, there is a ‘SW England granites’ theme that includes such rock types as granite, hydrothermal breccia, skarn and vein samples.
Category
A general term used to label a rock sample. It is a useful way of grouping similar samples throughout a collection. Category names are often, but not exclusively, common rock names (e.g. granite, basalt, dolerite, gabbro, greisen, skarn, gneiss, amphibolite, limestone, sandstone).
Owner
The owner of the sample that appears in the collection. For example, NASA owns all the samples that appear in the Moon Rocks collection
We would like to thank the following for the use of this sample: