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.
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Research Article|November 01, 2018
Gabrielsonite revisited: crystal-structure determination and redefinition of chemical formula
Natale Perchiazzi
Natale Perchiazzi
1Dipartimento Di Scienze Della Terra, Universita` di Pisa, via Santa Maria 53, 56126Pisa, Italy
Corresponding author, e-mail: natale.perchiazzi@unipi.it
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Ulf Hålenius
Ulf Hålenius
2Department of Geosciences, Swedish Museum of Natural History, PO Box 50007, 10405Stockholm, Sweden
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Pietro Vignola
Pietro Vignola
3CNR-Istituto per la dinamica dei processi ambientali, via Botticelli 23, 20131Milano, Italy
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Nicola Demitri
Nicola Demitri
4Elettra – Sincrotrone Trieste S.C.p.A.,S.S. 14 km 163, 5 in area science park – loc. Basovizza, 34149Trieste, Italy
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European Journal of Mineralogy (2018) 30 (6): 1173-1180.
Article history
received:
13 Feb 2018
rev-recd:
30 Apr 2018
accepted:
30 Apr 2018
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CiteCitation
Natale Perchiazzi, Ulf Hålenius, Pietro Vignola, Nicola Demitri; Gabrielsonite revisited: crystal-structure determination and redefinition of chemical formula. European Journal of Mineralogy ; 30 (6): 1173–1180. doi: https://doi.org/10.1127/ejm/2018/0030-2794
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Index Terms/Descriptors
- arsenic
- arsenites
- classification
- coordination
- crystal chemistry
- crystal structure
- definition
- descloizite
- electron probe data
- Europe
- ferric iron
- formula
- FTIR spectra
- holotypes
- infrared spectra
- iron
- lead
- metals
- Mossbauer spectra
- polyhedra
- Raman spectra
- Rietveld refinement
- Scandinavia
- spectra
- Sweden
- synchrotron radiation
- valency
- vanadates
- Varmland Sweden
- Western Europe
- X-ray diffraction data
- central Sweden
- gabrielsonite
- Langban Sweden
Latitude & Longitude