Ferriperbøeite-(Ce), ideally [CaCe3]∑=4[Fe3+Al2Fe2+]∑=4[Si2O7][SiO4]3O(OH)2, is a new mineral species from the Nya Bastnäs Fe–Cu–REE skarn deposit in the Bergslagen mining region (south-central Sweden). The mineral occurs in direct contact with ferriallanite-(Ce), cerite-(Ce) and törnebohmite-(Ce). In the type specimen, ferriperbøeite-(Ce) forms brownish black crystals, and exhibits an irregular to short-prismatic morphology elongated along [0 1 0]. The maximum crystal size is about 500 µm. The mineral is optically biaxial positive, with 2V = 65 ± 5°. It is strongly pleochroic from green, throughout orange-brown, to deep red colours. Electron microprobe analyses yields the empirical formula, calculated on the basis of 13 cations and divalent and trivalent iron partitioned to fulfill the criterion of charge balance, (Ca0.92La1.23Ce1.50Pr0.10Nd0.27Sm0.02Y0.01)∑=4.05()∑=4.02(Si4.92P0.01)∑=4.93O20(OH1.87F0.12Cl0.01), which is in accord with single-crystal X-ray diffraction, infra-red, and Mössbauer spectroscopy data. The mineral is monoclinic, space group P21/m, with unit-cell parameters: a = 8.9320(4), b = 5.7280(3), c = 17.5549(9) Å, β = 116.030(4)°, V = 807.05(7) Å3, Z = 2. Ferriperbøeite-(Ce) is as a new member of the epidote (E) − törnebohmite (T) polysomatic series, having an E module with ferriallanite-(Ce) composition. The new mineral and the mineral name have been approved by the Commission on New Minerals, Nomenclature and Classification, IMA 2017-037.
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Research Article|
May 01, 2018
Ferriperbøeite-(Ce), [CaCe3]∑=4[Fe3+Al2Fe2+]∑=4[Si2O7][SiO4]3O(OH)2, a new member of the polysomatic epidote–törnebohmite series from the Nya Bastnäs Fe-Cu-REE deposit, Sweden
Luca Bindi;
1
Dipartimento di Science de la Terra, Università degli Studi di Firenze
, via G. La Pira 4, 50121Firenze, Italy
2
CNR − Istituto di Geoscienze e Georisorse, Sezione di Firenze
, via G. La Pira 4, 50121Firenze, Italy
Corresponding author, e-mail: luca.bindi@unifi.it
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Dan Holtstam;
Dan Holtstam
3
Department of Geosciences, Swedish Museum of Natural History
, Box 50007, 104 05Stockholm, Sweden
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Giulia Fantappiè;
Giulia Fantappiè
1
Dipartimento di Science de la Terra, Università degli Studi di Firenze
, via G. La Pira 4, 50121Firenze, Italy
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Ulf B. Andersson;
Ulf B. Andersson
4
Luossavaara-Kiirunavaara AB, R&D, TG
, 981 86Kiruna, Sweden
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Paola Bonazzi
Paola Bonazzi
1
Dipartimento di Science de la Terra, Università degli Studi di Firenze
, via G. La Pira 4, 50121Firenze, Italy
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European Journal of Mineralogy (2018) 30 (3): 537–544.
Article history
received:
07 Aug 2017
rev-recd:
20 Sep 2017
accepted:
30 Sep 2017
first online:
04 May 2018
Citation
Luca Bindi, Dan Holtstam, Giulia Fantappiè, Ulf B. Andersson, Paola Bonazzi; Ferriperbøeite-(Ce), [CaCe3]∑=4[Fe3+Al2Fe2+]∑=4[Si2O7][SiO4]3O(OH)2, a new member of the polysomatic epidote–törnebohmite series from the Nya Bastnäs Fe-Cu-REE deposit, Sweden. European Journal of Mineralogy 2018;; 30 (3): 537–544. doi: https://doi.org/10.1127/ejm/2018/0030-2717
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Index Terms/Descriptors
- Bergslagen
- cell dimensions
- chemical composition
- color
- crystal structure
- crystal systems
- electron probe data
- epidote
- epidote group
- Europe
- formula
- FTIR spectra
- infrared spectra
- metamorphic rocks
- metasomatic rocks
- monoclinic system
- morphology
- Mossbauer spectra
- new minerals
- orthosilicates
- paragenesis
- physical properties
- pleochroism
- Scandinavia
- silicates
- skarn
- sorosilicates
- space groups
- spectra
- Sweden
- Western Europe
- X-ray diffraction data
- tornebohmite
- Nya Bastnas Deposit
- ferriperboeite
Latitude & Longitude
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