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Ferro-ferri-katophorite from
Motzfeldt Centre, Igaliku Complex, Kujalleq, Greenland


Locality type:Intrusion
Classification
Species:Ferro-ferri-katophorite
Formula:Na(NaCa)(Fe42+Fe3+)(Si7Al)O22(OH)2
Chemical Analyses:
Oxide wt%:
1
SiO244.18 %
TiO22.05 %
Al2O35.68 %
Fe2O35.29 %
FeO21.03 %
MnO1.46 %
MgO5.29 %
CaO7.64 %
Na2O5.05 %
K2O1.63 %
Total:99.30 %
Sample references:
1 -
Bradshaw, C. (1988). A petrographic structural and geochemical study of the alkaline igneous rocks of the Motzfeldt Centre South Greenland. Doctoral dissertation, Durham University.
Comments:Schönenberger, J., & Markl, G. (2008) provides 7 analyses of amphiboles from this locality, and all but one fall within the ferro-ferri-katophorite compositional space usin Locock 2014 for normalization. Ferro-ferri-katophorite is the dominant amphibole in nepheline-syenites and "moderately alkaline" syenites.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Ferro-ferri-katophorite data
Locality Data:Click here to view Motzfeldt Centre, Igaliku Complex, Kujalleq, Greenland
Data Identifiers
Mindat Occurrence Record ID:1385401
Long-form Identifier:1:3:1385401:2
GUID (UUID V4):0
References
Schönenberger, J., Markl, G. (2008) The Magmatic and Fluid Evolution of the Motzfeldt Intrusion in South Greenland: Insights into the Formation of Agpaitic and Miaskitic Rocks. Journal of Petrology, 49 (9) 1549-1577 doi:10.1093/petrology/egn037
 
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