Gabrielsonite revisited: Crystal-structure determination and redefinition of chemical formula
European Journal of Mineralogy, ISSN: 1617-4011, Vol: 30, Issue: 6, Page: 1173-1180
2018
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Article Description
A reinvestigation of gabrielsonite from the holotype specimen from Långban, central Sweden, using single-crystal synchrotron X-ray diffraction, electron-microprobe techniques and Fourier-transform infrared (FTIR) spectroscopy, Raman and Mössbauer spectroscopies show that the mineral is an anhydrous Fe-bearing arsenite and not a hydrous Fe-bearing arsenate, as originally proposed. The revised ideal chemical formula of gabrielsonite is PbFe(AsO3)O. The mineral is related to the descloizite supergroup, but it differs through the valencies of the non-Pb cations Fe (M vs. M) and As (3 + vs. 4 +) and through lower coordination of Pb (4 vs. 7-8) and As (3 vs. 4). The redefinition of gabrielsonite (proposal 17-G) has been approved by the Commission on New Minerals, Nomenclature and Classification (CNMNC) of the International Mineralogical Association.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85058788967&origin=inward; http://dx.doi.org/10.1127/ejm/2018/0030-2794; http://www.schweizerbart.de/papers/ejm/detail/30/89785/Gabrielsonite_revisited_crystal_structure_determin?af=crossref; https://www.ingentaconnect.com/content/schweiz/ejm/2018/00000030/00000006/art00012; https://dx.doi.org/10.1127/ejm/2018/0030-2794; https://www.schweizerbart.de/papers/ejm/detail/30/89785/Gabrielsonite_revisited_crystal_structure_determin?af=crossref
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