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Gabrielsonite revisited: crystal-structure determination and redefinition of chemical formula
Università di Pisa, Italy.
Swedish Museum of Natural History, Department of Geology.
CNR, Milano, Italy.
ELETTRA, Trieste, Italy.
2018 (English)In: European journal of mineralogy, ISSN 0935-1221, E-ISSN 1617-4011, Vol. 30, no 6, p. 1173-1180Article in journal (Refereed) Published
Abstract [en]

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 Fe3+-bearing arsenite and not a hydrous Fe2+-bearing arsenate, as originally proposed. The revised ideal chemical formula of gabrielsonite is PbFe3(As3+O3)O. The mineral is related to the descloizite supergroup, but it differs through the valencies of the non-Pb cations Fe (M3+ vs. M2+) 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.

Place, publisher, year, edition, pages
2018. Vol. 30, no 6, p. 1173-1180
National Category
Geochemistry
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-3100DOI: 10.1127/ejm/2018/0030-2794OAI: oai:DiVA.org:nrm-3100DiVA, id: diva2:1270362
Available from: 2018-12-13 Created: 2018-12-13 Last updated: 2018-12-13Bibliographically approved

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