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Re-investigation of ‘minasgeraisite-(Y)’ from the Jaguaraçu pegmatite, Brazil and high-temperature crystal chemistry of gadolinite-supergroup minerals

Published online by Cambridge University Press:  17 March 2023

Oleg S. Vereshchagin Open the ORCID record for Oleg S. Vereshchagin [Opens in a new window] ,
Liudmila A. Gorelova Open the ORCID record for Liudmila A. Gorelova [Opens in a new window] ,
Anastasia K. Shagova ,
Anatoly V. Kasatkin Open the ORCID record for Anatoly V. Kasatkin [Opens in a new window] ,
Radek Škoda ,
Vladimir N. Bocharov Open the ORCID record for Vladimir N. Bocharov [Opens in a new window] ,
Natalia S. Vlasenko Open the ORCID record for Natalia S. Vlasenko [Opens in a new window]  and
Michaela Vašinová Galiová
Oleg S. Vereshchagin*
Affiliation:
Institute of Earth Sciences, Saint Petersburg State University, University Embankment 7/9, 199034 St. Petersburg, Russia
Liudmila A. Gorelova
Affiliation:
Institute of Earth Sciences, Saint Petersburg State University, University Embankment 7/9, 199034 St. Petersburg, Russia
Anastasia K. Shagova
Affiliation:
Institute of Earth Sciences, Saint Petersburg State University, University Embankment 7/9, 199034 St. Petersburg, Russia
Anatoly V. Kasatkin
Affiliation:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninskiy Prospect 18, 119071 Moscow, Russia
Radek Škoda
Affiliation:
Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, CZ 611 37 Brno, Czech Republic
Vladimir N. Bocharov
Affiliation:
Geomodel Resource Center, Saint Petersburg State University, Ulyanovskaya Str. 1, 198504 St. Petersburg, Russia
Natalia S. Vlasenko
Affiliation:
Geomodel Resource Center, Saint Petersburg State University, Ulyanovskaya Str. 1, 198504 St. Petersburg, Russia
Michaela Vašinová Galiová
Affiliation:
Institute of Chemistry and Technology of Environmental Protection, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, 61200 Brno, Czech Republic BIC Brno, Purkyňova 125, 612 00, Brno, Czech Republic
*
*Corresponding author: Oleg S. Vereshchagin; Email: o.vereshchagin@spbu.ru
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Abstract

The chemical composition (including B, Be and Li), the Raman spectrum and the crystal-structure evolution (at the temperature range 27–1000°C) of a Mn-bearing, Bi-rich gadolinite-subgroup mineral from the Jaguaraçu Pegmatite, Brazil (type-locality of minasgeraisite-(Y)) was studied. Elemental mapping revealed that the crystal investigated has complex chemical zonation with various Bi (~8–24 wt.% Bi2O3), Ca (~8–10 wt.% CaO) and Y (~11–17 wt.% Y2O3) content. The sample investigated has all the specific features of the chemical composition of minasgeraisite-(Y), except Ca excess and, thus, should be considered as hingganite-(Y). The Raman spectrum of the sample under study has bands at 140, 179, 243, 350, 446, 519, 559, 625, 902, 973, 3224, 3353, 3532 and 3763 cm–1, and is similar to that of hingganite-(Y) / -(Nd). Crystal-structure refinement confirmed that the crystal in question should be considered as hingganite-(Y) and is in line with the previously obtained data on gadolinite-subgroup minerals from the Jaguaraçu Pegmatite. High-temperature single-crystal X-ray diffraction studies revealed that the mineral starts to decompose above 800°C. We can conclude that beryllosilicates are most stable at high-temperature conditions within the gadolinite supergroup and that species with a higher M-site occupancy have higher stability upon heating.

Keywords

gadoliniteberyllosilicateminasgeraisite-(Y)RamanJaguaraçu Pegmatitesingle-crystal X-ray diffractionhigh temperature
Type
Article
Information
Mineralogical Magazine , Volume 87 , Issue 3 , June 2023 , pp. 470 - 479
Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland

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Footnotes

Associate Editor: G. Diego Gatta

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