Articles | Volume 36, issue 1
https://doi.org/10.5194/ejm-36-73-2024
https://doi.org/10.5194/ejm-36-73-2024
Research article
 | 
16 Jan 2024
Research article |  | 16 Jan 2024

Pilanesbergite: a new rock-forming mineral occurring in nepheline syenite from the Pilanesberg Alkaline Complex, South Africa

Fabrice Dal Bo, Henrik Friis, Marlina A. Elburg, Frédéric Hatert, and Tom Andersen

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Cited articles

Andersen, T. and Friis, H.: The Transition from Agpaitic to Hyperagpaitic Magmatic Crystallization in the Ilímaussaq Alkaline Complex, South Greenland, J. Petrol., 56, 1343–1364, https://doi.org/10.1093/petrology/egv039, 2015. 
Andersen, T. and Sørensen, H.: Stability of naujakasite in hyperagpaitic melts, and the petrology of naujakasite lujavrite in the Ilímaussaq alkaline complex, South Greenland, Mineral. Mag., 69, 125–136, https://doi.org/10.1180/0026461056920240, 2005. 
Andersen, T., Erambert, M., Larsen, A. O., and Selbekk, R. S.: Petrology of nepheline syenite pegmatites in the Oslo Rift, Norway: Zirconium silicate mineral assemblages as indicators of alkalinity and volatile fugacity in mildly agpaitic magma, J. Petrol., 51, 2303–2325, https://doi.org/10.1093/petrology/egq058, 2010. 
Andersen, T., Elburg, M. A., and Erambert, M.: The miaskitic-to-agpaitic transition in peralkaline nepheline syenite (white foyaite) from the Pilanesberg Complex, South Africa, Chem. Geol., 455, 166–181, https://doi.org/10.1016/j.chemgeo.2016.08.020, 2017. 
Andersen, T., Elburg, M. A., and Erambert, M.: Contrasting trends of agpaitic crystallization in nepheline syenite in the Pilanesberg Complex, South Africa, Lithos, 312–313, 375–388, https://doi.org/10.1016/j.lithos.2018.05.015, 2018. 
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Short summary
We report the description and the characterization of a new mineral species, found in a rock sample from the geological formation called the Pilanesberg Complex, South Africa. This is a silicate mineral that contains a significant amount of sodium, calcium, iron, titanium and fluorine. Its atomic structure shows that it is related to other wöhlerite-group minerals. This work provides new insights into the crystallization conditions that ruled the formation of the Pilanesberg complex.