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The crystal structure of turneaureite, Ca5(AsO4)3Cl, the arsenate analog of chlorapatite, and its relationships with the arsenate apatites johnbaumite and svabite

  • Cristian Biagioni EMAIL logo , Ferdinando Bosi , Ulf Hålenius and Marco Pasero
Published/Copyright: October 2, 2017
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American Mineralogist
From the journal American Mineralogist Volume 102 Issue 10

Abstract

The crystal structure of turneaureite, ideally Ca5(AsO4)3Cl, was studied using a specimen from the Brattfors mine, Nordmark, Värmland, Sweden, by means of single-crystal X-ray diffraction data. The structure was refined to R1 = 0.017 on the basis of 716 unique reflections with Fo > 4σ(Fo) in the P63/m space group, with unit-cell parameters a = 9.9218(3), c = 6.8638(2) Å, V = 585.16(4) Å3. The chemical composition of the sample, determined by electron-microprobe analysis, is (in wt%; average of 10 spot analyses): SO3 0.22, P2O5 0.20, V2O5 0.01, As2O5 51.76, SiO2 0.06, CaO 41.39, MnO 1.89, SrO 0.12, BaO 0.52, PbO 0.10, Na2O 0.02, F 0.32, Cl 2.56, H2Ocalc 0.58, O(=F+Cl) −0.71, total 99.04. On the basis of 13 anions per formula unit, the empirical formula corresponds to (Ca4.82Mn0.17Ba0.02Sr0.01)Σ5.02(As2.94P0.02S0.02Si0.01)Σ2.99O12[Cl0.47(OH)0.42F0.11]Σ1.00.

Turneaureite is topologically similar to the other members of the apatite supergroup: columns of face-sharing M1 polyhedra running along c are connected through TO4 tetrahedra with channels hosting M2 cations and X anions. Owing to its particular chemical composition, the studied turneaureite can be considered as a ternary calcium arsenate apatite; consequently it has several partially filled anion sites within the anion columns. Polarized single-crystal FTIR spectra of the studied sample indicate stronger hydrogen bonding and less diverse short-range atom arrangements around (OH) groups in turneaureite as compared to the related minerals johnbaumite and svabite. An accurate knowledge of the atomic arrangement of this apatite-remediation mineral represents an improvement in our understanding of minerals able to sequester and stabilize heavy metals such as arsenic in polluted areas.

Keywords: Turneaureite; calcium arsenate; apatite supergroup; crystal structure; infrared spectroscopy; Sweden; Apatite: A common mineral; uncommonly versatile

Special collection papers can be found online at http://www.minsocam.org/MSA/AmMin/special-collections.html.

Acknowledgments

We thank Marcello Serracino who assisted us during electron-microprobe analysis. M.P. acknowledges the financial support from the University of Pisa (PRA_2015_0028). Fernando Cámara, Anthony R. Kampf, and an anonymous reviewer helped us improving the paper.

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Received: 2016-12-3
Accepted: 2017-6-7
Published Online: 2017-10-2
Published in Print: 2017-10-26

© 2017 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2017-6041
Keywords for this article
Turneaureite; calcium arsenate; apatite supergroup; crystal structure; infrared spectroscopy; Sweden; Apatite: A common mineral; uncommonly versatile

Articles in the same Issue

  1. Highlights and Breakthroughs
  2. Making a fine-scale ruler for oxide inclusions
  3. Special Collection: Biomaterials—Mineralogy Meets Medicine
  4. Substitution of sulfate in apatite
  5. Actinides in Geology, Energy, and the Environment
  6. Thermodynamic characterization of synthetic autunite
  7. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  8. The crystal structure of turneaureite, Ca5(AsO4)3Cl, the arsenate analog of chlorapatite, and its relationships with the arsenate apatites johnbaumite and svabite
  9. Special Collection: From Magmas to Ore Deposits
  10. Cu-Mo partitioning between felsic melts and saline-aqueous fluids as a function of XNaCleq, fO2, and fS2
  11. Special Collection: Dynamics of Magmatic Processes
  12. Continuous mush disaggregation during the long-lasting Laki fissure eruption, Iceland
  14. A new hydrothermal moissanite cell apparatus for optical in-situ observations at high pressure and high temperature, with applications to bubble nucleation in silicate melts
  16. Experimental and thermodynamic investigations on the stability of Mg14Si5O24 anhydrous phase B with relevance to Mg2SiO4 forsterite, wadsleyite, and ringwoodite
  18. Model for the origin, ascent, and eruption of lunar picritic magmas
  20. Phase relations of Fe-Mg spinels including new high-pressure post-spinel phases and implications for natural samples
  22. A Raman calibration for the quantification of SO42− groups dissolved in silicate glasses: Application to natural melt inclusions
  24. The system fayalite-albite-anorthite and the syenite problem
  26. Kiglapait mineralogy V: Feldspars in a hot, dry magma
  28. Orientation of exsolution lamellae in mantle xenolith pyroxenes and implications for calculating exsolution pressures
  30. Spin state and electronic environment of iron in basaltic glass in the lower mantle
  32. A shallow origin of so-called ultrahigh-pressure chromitites, based on single-crystal X-ray structure analysis of the high-pressure Mg2Cr2O5 phase, with modified ludwigite-type structure
  34. Biologically mediated crystallization of buddingtonite in the Paleoproterozoic: Organic-igneous interactions from the Volyn pegmatite, Ukraine
  36. Mengxianminite (Ca2Sn2Mg3Al8[(BO3)(BeO4)O6]2) a new borate mineral from Xianghualing skarn, Hunan Province, China, with a highly unusual chemical combination (B + Be + Sn)
  37. Letter: Special Collection: Nanominerals and Mineral Nanoparticles
  38. Previously unknown mineral-nanomineral relationships with important environmental consequences: The case of chromium release from dissolving silicate minerals
  39. Letter: Special Collection: Nanominerals and Mineral Nanoparticles
  40. Protoenstatite: A new mineral in Oregon sunstones with “watermelon” colors
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