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Kakortokite

A rock subtype
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08984620017272472712601.jpg
Kakortokite

Ilímaussaq complex, Kujalleq, Greenland
06582660017272472727069.jpg
Kakortokite

Ilímaussaq complex, Kujalleq, Greenland
09374520017272285902239.jpg
Kakortokite

Kringlerne, Kangerluarsuk Fjord, Ilímaussaq complex, Kujalleq, Greenland
01892330017271952978263.jpg
Kakortokite

Ilímaussaq complex, Kujalleq, Greenland
07317840017271952982238.jpg
Kakortokite

Ilímaussaq complex, Kujalleq, Greenland
09374520017272285902239.jpg
Kakortokite

Kringlerne, Kangerluarsuk Fjord, Ilímaussaq complex, Kujalleq, Greenland
01892330017271952978263.jpg
Kakortokite

Ilímaussaq complex, Kujalleq, Greenland
02388210017271953004749.jpg
Kakortokite

Ilímaussaq complex, Kujalleq, Greenland
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About KakortokiteHide

Name:
Named for the historical name of the locality: Qaqortoq, Kujalleq, Greenland.
A local name for 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.


Unique IdentifiersHide

Mindat ID:
50010
Long-form identifier:
mindat:1:1:50010:8

Classification of KakortokiteHide

Mineralogy of KakortokiteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Amphibole > ArfvedsoniteNaNa2(Fe2+4Fe3+)Si8O22(OH)2
EudialyteNa15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2
Feldspar > Alkali FeldsparA subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium.
Feldspathoid > NephelineNa3K(Al4Si4O16)

Chemical AnalysisHide

Oxide wt%:
 123
SiO249.93 %50.83 %52.22 %
TiO20.40 %0.28 %0.28 %
ZrO21.16 %3.46 %0.93 %
Al2O310.91 %10.91 %17.24 %
Fe2O38.92 %4.54 %5.89 %
FeO10.98 %6.86 %3.79 %
MnO0.54 %0.59 %0.22 %
MgO0.40 %0.22 %0.23 %
CaO1.98 %4.21 %1.80 %
Na2O8.85 %10.66 %10.60 %
K2O2.98 %3.02 %4.38 %
P2O50.06 %0.04 %0.02 %
H2O2.78 %2.22 %2.14 %
Cl0.07 %0.41 %0.17 %
F0.42 %0.29 %0.16 %
SO30.51 %0.05 %
Total:100.38 %99.05 %100.12 %
Sample references:
IDLocalityReferenceNotes
1Ilímaussaq complex, Kujalleq, Greenland
Ferguson, John (1970) The differentiation of agpaitic magmas; the Ilimaussaq intrusion, south Greenland. The Canadian Mineralogist, 10 (3). p.335-349.
Average of 4 analyses of kakortokite consisting of K-feldspar/perthite (12.8 vol%), albite laths (3.9 vol%), nepheline (10.4 vol%), altered nepheline (4.4 vol%), pyroxenes (6.2 vol%), amphiboles (42.9%), aenigmatite (tr), eudialyte (0.5 vol%), altered eudialyte (9.2 vol%), sodalite (0.7 vol%), analcime (4.2vol%), natrolite(4.7. vol%), fluorite (0.1), mica (tr), opaques (tr). Method not given, presumably wet chemical.
2  "  "
Ferguson, John (1970) The differentiation of agpaitic magmas; the Ilimaussaq intrusion, south Greenland. The Canadian Mineralogist, 10 (3). p.335-349.
Average of 4 analyses of kakortokite consisting of K-feldspar/perthite (29.9 vol%), albite laths (3.3 vol%), nepheline (12.8 vol%), altered nepheline (7.0 vol%), pyroxenes (2.9 vol%), amphiboles (10.4%), aenigmatite (0.3 vol%), eudialyte (27.0 vol%), altered eudialyte (3.3 vol%), analcime (1.3 vol%), natrolite(1.8. vol%), fluorite (tr), mica (tr), opaques (tr). Method not given, presumably wet chemical.
3  "  "
Ferguson, John (1970) The differentiation of agpaitic magmas; the Ilimaussaq intrusion, south Greenland. The Canadian Mineralogist, 10 (3). p.335-349.
Average of 4 analyses of kakortokite consisting of K-feldspar/perthite (36.1 vol%), albite laths (5.2 vol%), nepheline (15.9 vol%), altered nepheline (7.4 vol%), pyroxenes (8.8 vol%), amphiboles (9.7%), aenigmatite (0.2 vol%), eudialyte (1.6 vol%), altered eudialyte (7.6 vol%), sodalite (0.8vol%), analcime (5.0 vol%), natrolite(1.6. vol%), fluorite (0.1 vol%), mica (tr), opaques (tr). Method not given, presumably wet chemical.

Common AssociatesHide

Associations Based on Photo Data:
3 photos of Kakortokite associated with ArfvedsoniteNaNa2(Fe2+4Fe3+)Si8O22(OH)2
3 photos of Kakortokite associated with EudialyteNa15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2
3 photos of Kakortokite associated with Feldspar Group

Internet Links for KakortokiteHide