Startseite The crystal structure of svabite, Ca5(AsO4)3F, an arsenate member of the apatite supergroup
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The crystal structure of svabite, Ca5(AsO4)3F, an arsenate member of the apatite supergroup

  • Cristian Biagioni EMAIL logo , Ferdinando Bosi , Ulf Hålenius und Marco Pasero
Veröffentlicht/Copyright: 30. Juli 2016
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 101 Heft 8

Abstract

The crystal structure of svabite, ideally Ca5(AsO4)3F, was studied using a specimen from the Jakobsberg mine, Värmland, Sweden, by means of single-crystal X-ray diffraction data. The structure was refined to R1 = 0.032 on the basis of 928 unique reflections with Fo > 4σ(Fo) in the P63/m space group, with unit-cell parameters a = 9.7268(5), c = 6.9820(4) Å, V = 572.07(5) Å3. The chemical composition of the sample, determined by electron-microprobe analysis, is (in wt%, average of 10 spot analyses): SO3 0.49, P2O5 0.21, V2O5 0.04, As2O5 51.21, SiO2 0.19, CaO 39.31, MnO 0.48, SrO 0.03, PbO 5.19, Na2O 0.13, F 2.12, Cl 0.08, H2Ocalc 0.33, O (≡ F+Cl) –0.91, total 98.90. On the basis of 13 anions per formula unit, the empirical formula corresponds to (Ca4.66Pb0.16Mn0.04Na0.03)Σ4.89(As2.96S0.04Si0.02P0.02)Σ3.04O12 [F0.74(OH)0.24Cl0.01]. Svabite 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. The crystal structure of synthetic Ca5(AsO4)3F was previously reported as triclinic. On the contrary, the present refinement of the crystal structure of svabite shows no deviations from the hexagonal symmetry. 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: Svabite; calcium arsenate; apatite supergroup; crystal structure; Jakobsberg mine; Sweden

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

Acknowledgments

We thank M. Serracino who assisted us during electron-microprobe analysis. MP acknowledges financial support from the University of Pisa (PRA_2015_0028). J. Hughes and J. Rakovan acted as reviewers, helping us in improving the manuscript.

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Received: 2015-11-27
Accepted: 2016-3-27
Published Online: 2016-7-30
Published in Print: 2016-8-1

© 2016 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2016-5636
Schlagwörter für diesen Artikel
Svabite; calcium arsenate; apatite supergroup; crystal structure; Jakobsberg mine; Sweden

Artikel in diesem Heft

  1. Highlights and Breakthroughs
  2. A new approach to the ionic model
  3. Highlights and Breakthroughs
  4. Na-P concentrations in high-pressure garnets: A potentially rich, but risky P-T repository
  5. Special Collection: Perspectives on Origins and Evolution of Crustal Magmas
  6. Crystal accumulation in a tilted arc batholith
  7. Research Article
  8. A tale of two garnets: The role of solid solution in the development toward a modern mineralogy
  9. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  10. The crystal structure of svabite, Ca5(AsO4)3F, an arsenate member of the apatite supergroup
  11. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  12. From phosphates to silicates and back: an experimental study on the transport and storage of phosphorus in eclogites during uplift and exhumation
  13. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  14. Fluorapatite-monazite-allanite relations in the Grängesberg apatite-iron oxide ore district, Bergslagen, Sweden
  15. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  16. Solid solution in the apatite OH-Cl binary system: Compositional dependence of solid-solution mechanisms in calcium phosphate apatites along the Cl-OH binary
  17. Special Collection: Advances in Ultrahigh-Pressure Metamorphism
  18. Dissolution-reprecipitation metasomatism and growth of zircon within phosphatic garnet in metapelites from western Massachusetts
  19. Special Collection: New Advances In Subduction Zone Magma Genesis
  20. Origin and petrogenetic implications of anomalous olivine from a Cascade forearc basalt
  21. Versatile Monazite: Resolving Geological Records and Solving Challenges in Materials Science
  22. Monazite age constraints on the tectono-thermal evolution of the central Appalachian Piedmont
  23. Research Article
  24. A new EPMA method for fast trace element analysis in simple matrices
  25. Research Article
  26. Location and stability of europium in calcium sulfate and its relevance to rare earth recovery from phosphogypsum waste
  27. Research Article
  28. A preliminary valence-multipole potential energy model: Al-Si-H-O system
  29. Research Article
  30. Optical phonons, OH vibrations, and structural modifications of phlogopite at high temperatures: An in-situ infrared spectroscopic study
  31. Research Article
  32. Redox states of uranium in samples of microlite and monazite
  33. Research Article
  34. Effects of differential stress on the structure and Raman spectra of calcite from first-principles calculations
  35. Research Article
  36. Oxygen diffusion and exchange in dolomite rock at 700 °C, 100 MPa
  37. Research Article
  38. Fluid inclusion examination of the transition from magmatic to hydrothermal conditions in pegmatites from San Diego County, California
  39. Letter
  40. Nanoscale gold clusters in arsenopyrite controlled by growth rate not concentration: Evidence from atom probe microscopy
  41. New Mineral Names
  42. New Mineral Names
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