Greenland: Arfvedsonite Lujavrite
Collection:
Click the microscope button to view a thin section for this sample.
Microscope
Click the microscope button to view a thin section for this sample.
Microscope

Fact sheet

Greenland: Arfvedsonite Lujavrite

Sample MTD04 colected by Michael T. Doel

Described as tugtupite, analcime, sodalite etc.

Rotation 1 -

Rotation 2 - zircon Zr(SiO4)

Rotation 3 - aenigmatite Na2(Fe2+5Ti)SiO20

Rotation 4 - polylithionite KLi2Al(Si4O10)(F,OH)2

Rotation 5 -

Rotation 6 - steenstrupine Na14Mn22+(Fe3+,Mn3+)2Ce6(Zr,Th)(Si6O18)2(PO4)6(HPO4)(OH)2·2H2O

Rotation 7 - arfvedsonite [Na][Na2][Fe42+Fe3+]Si8O22(OH)2

Rotation 8 -

Rotation 9 -

Ilimaussaq is the type locality for arfvedsonite and steenstrupine

Intrusion is dated at 1161±2 Ma

Additional images
  • Long wavelength UV - orange sodalite
  • width 6 cm
  • Long wavelength UV - orange sodalite
  • width 6 cm
  • Long wavelength UV - orange sodalite
Map
60.93677, -45.903625
Description:
Ilimaussaq intrusion, Taseq Slope West, Narsaq, 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
arfvedsonite
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: