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The parisite–(Ce) enigma: challenges in the identification of fluorcarbonate minerals

Urheber*innen

Zeug,  Manuela
External Organizations;

Nasdala,  Lutz
External Organizations;

Ende,  Martin
External Organizations;

Habler,  Gerlinde
External Organizations;

Hauzenberger,  Christoph
External Organizations;

Chanmuang N.,  Chutimun
External Organizations;

Škoda,  Radek
External Organizations;

Topa,  Dan
External Organizations;

Wildner,  Manfred
External Organizations;

/persons/resource/wirth

Wirth,  R.
3.5 Interface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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5003579.pdf
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Zitation

Zeug, M., Nasdala, L., Ende, M., Habler, G., Hauzenberger, C., Chanmuang N., C., Škoda, R., Topa, D., Wildner, M., Wirth, R. (2021): The parisite–(Ce) enigma: challenges in the identification of fluorcarbonate minerals. - Mineralogy and Petrology, 115, 1-19.
https://doi.org/10.1007/s00710-020-00723-x


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5003579
Zusammenfassung
A multi-methodological study was conducted in order to provide further insight into the structural and compositional complexity of rare earth element (REE) fluorcarbonates, with particular attention to their correct assignment to a mineral species. Polycrystals from La Pita Mine, Municipality de Maripí, Boyacá Department, Colombia, show syntaxic intergrowth of parisite–(Ce) with röntgenite–(Ce) and a phase which is assigned to B3S4 (i.e., bastnäsite-3–synchisite-4; still unnamed) fluorcarbonate. Transmission electron microscope (TEM) images reveal well-ordered stacking patterns of two monoclinic polytypes of parisite–(Ce) as well as heavily disordered layer sequences with varying lattice fringe spacings. The crystal structure refinement from single crystal X-ray diffraction data – impeded by twinning, complex stacking patterns, sequential and compositional faults – indicates that the dominant parisite–(Ce) polytype M1 has space group Cc. Parisite–(Ce), the B3S4 phase and röntgenite–(Ce) show different BSE intensities from high to low. Raman spectroscopic analyses of parisite–(Ce), the B3S4 phase and röntgenite–(Ce) reveal different intensity ratios of the three symmetric CO3 stretching bands at around 1100 cm−1. We propose to non-destructively differentiate parisite–(Ce) and röntgenite–(Ce) by their 1092 cm−1 / 1081 cm−1 ν1(CO3) band height ratio.