Single-crystal X-ray crystal-structure refinements and electron-microprobe analyses of two julgoldite samples, in one case complemented by Mössbauer spectroscopy to determine the Fe valence distribution, yielded the compositions Ca2.00X(Fe2+0.44Fe3+0.29Mg0.17Al0.10)Y(Fe3+0.82Al0.18)2Si3O10.39(OH)3.61 (Bombay) and Ca2.00X(Fe0.67Mg0.16Al0.17)Y(Fe3+0.81Al0.19)2Si3O14 − n(OH)n (4 ≥ n ≥ 3) (Kreimbach/Kaulbach), respectively. Structure refinements also allowed specification of the system of hydrogen bonds, which concur with those known for pumpellyite. A review of structural and chemical data for pumpellyite-group minerals including six julgoldite samples indicated that the length of the b axis is governed by the average size of ionic radii at the Y site, except for one sample of julgoldite-(Fe3+). Size effects of the concentration of “large” divalent cations (Mg, Fe) at the X site can be seen in the lateral extension of the (010) plane that acts as a buffer to accomodate the variable size of the X octahedra. Using unit-cell plots, the data suggest that five of the six tested julgoldite samples are julgoldite-(Fe2+) and only the one sample of the Bombay area studied by Artioli et al. (2003) is julgoldite-(Fe3+). Both samples studied in this paper were classified into julgoldite-(Fe2+). In contrast to pumpellyite samples sensu stricto, which exhibit a Me2+:Me3+ ratio of approximately 1:1, julgoldite samples may cover the whole range between Ca2X(Fe3+)Y(Fe3+)2Si3O11(OH)3 and Ca2X(Fe2+)Y(Fe3+)2Si3O10(OH)4.
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Research Article|
July 01, 2018
Crystal chemistry of julgoldite, a mineral series of the pumpellyite group: re-investigation of Fe distribution and hydrogen-bonding
Mariko Nagashima;
1
Graduate school of Sciences and Technology for Innovation, Yamaguchi University
, Yamaguchi753-8512, Japan
Corresponding author, e-mail: nagashim@yamaguchi-u.ac.jp
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Georgia Cametti;
Georgia Cametti
2
Mineralogical Crystallography, Institute of Geological Sciences, University of Bern
, Baltzerstrasse 1+3, 3012Bern, Switzerland
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Thomas Armbruster
Thomas Armbruster
2
Mineralogical Crystallography, Institute of Geological Sciences, University of Bern
, Baltzerstrasse 1+3, 3012Bern, Switzerland
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1
Graduate school of Sciences and Technology for Innovation, Yamaguchi University
, Yamaguchi753-8512, Japan
Georgia Cametti
2
Mineralogical Crystallography, Institute of Geological Sciences, University of Bern
, Baltzerstrasse 1+3, 3012Bern, Switzerland
Thomas Armbruster
2
Mineralogical Crystallography, Institute of Geological Sciences, University of Bern
, Baltzerstrasse 1+3, 3012Bern, Switzerland
Corresponding author, e-mail: nagashim@yamaguchi-u.ac.jp
Publisher: Deutsche Mineralogische Gesellschaft, Sociedad Española de Mineralogia, Societá Italiana di Mineralogia e Petrologia, Société Francaise de Minéralogie
Received:
10 Jun 2017
Revision Received:
27 Jul 2017
Accepted:
29 Jul 2017
First Online:
15 May 2018
Online ISSN: 1617-4011
Print ISSN: 0935-1221
© 2018 E. Schweizerbart'sche Verlagsbuchhandlung, D-70176 Stuttgart
European Journal of Mineralogy (2018) 30 (4): 721–731.
Article history
Received:
10 Jun 2017
Revision Received:
27 Jul 2017
Accepted:
29 Jul 2017
First Online:
15 May 2018
Citation
Mariko Nagashima, Georgia Cametti, Thomas Armbruster; Crystal chemistry of julgoldite, a mineral series of the pumpellyite group: re-investigation of Fe distribution and hydrogen-bonding. European Journal of Mineralogy 2018;; 30 (4): 721–731. doi: https://doi.org/10.1127/ejm/2018/0030-2747
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Index Terms/Descriptors
- Asia
- cell dimensions
- Central Europe
- chemical composition
- crystal chemistry
- electron probe data
- Europe
- Germany
- India
- Indian Peninsula
- iron
- julgoldite
- Maharashtra India
- metals
- mineral composition
- Mossbauer spectra
- Mumbai India
- orthosilicates
- pumpellyite group
- refinement
- Rhineland-Palatinate Germany
- silicates
- sorosilicates
- spectra
- unit cell
- valency
- X-ray diffraction data
- hydrogen bonding
- Khandivali Quarry
- Krembach-Kaulbach Quarry
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