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Fluorwavellite, Al3(PO4)2(OH)2F·5H2O, the fluorine analog of wavellite

  • Anthony R. Kampf EMAIL logo , Paul M. Adams , Henry Barwood and Barbara P. Nash
Published/Copyright: April 3, 2017
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American Mineralogist
From the journal American Mineralogist Volume 102 Issue 4

Abstract

Fluorwavellite (IMA2015-077), Al3(PO4)2(OH)2F·5H2O, the F analog of wavellite, is a new mineral from the Silver Coin mine, Valmy, Iron Point district, Humboldt County, Nevada, and the Wood mine, 5 miles NE of Del Rio, Cocke County, Tennessee; at both occurrences it is a low-temperature secondary mineral. Fluorwavellite is essentially identical to wavellite in appearance and physical properties. Optically, fluorwavellite is biaxial positive, with α = 1.522(1), β = 1.531(1), and γ = 1.549(1) (white light). Electron microprobe analyses (average of nine for each co-type locality) provided the empirical formulas Al2.96(PO4)2(OH)1.98F1.02·5H2O (+0.12 H) for the Silver Coin mine and Al2.98(PO4)2(OH)2.11F0.89·5H2O (+0.06 H) for the Wood mine. Fluorwavellite is orthorhombic, Pcmn, with the cell parameters determined on a Wood mine crystal: a = 9.6311(4), b = 17.3731(12), c = 6.9946(3) Å, V = 1170.35(11) Å3, and Z = 4. The five strongest lines in the X-ray powder diffraction pattern are [dobs in Å (I) (hkl)]: 8.53 (100) (020,110); 5.65 (26) (101); 3.430 (28) (141,012); 3.223 (41) (240); and 2.580 (28) (331,161,232). The structure of fluorwavellite (R1 = 3.42% for 1248 Fo > 4σF reflections) is the same as that of wavellite, differing only in having one of the two independent hydroxyl sites replaced by F. A survey of F contents in wavellite-fluorwavellite from the five most common genetic types of occurrence (fluid expulsion, hydrothermal ore alteration, pegmatite phosphate alteration, residual carbonate weathering, and sedimentary leached zone) shows that F content, and the occurrence of wavellite vs. fluorwavellite, does not correlate with the type of the occurrence. It is more likely related to the fluid activity of Al, P, and F, with pH probably being an important factor. The role that wavellite and fluorwavellite play in sequestering F in the environment may be significant.

Keywords: Fluorwavellite; new mineral; crystal structure; Raman spectroscopy; infrared spectroscopy; wavellite; Silver Coin mine; Nevada, U.S.A.; Wood mine; Tennessee, U.S.A

Acknowledgments

Reviewers Ferdinando Bosi and Ian Gray are thanked for their constructive comments on the manuscript. Anatoly Kasatkin is thanked for analyses of fluorwavellite samples in the collection of the Fersman Museum. A portion of this study was funded by the John Jago Trelawney Endowment to the Mineral Sciences Department of the Natural History Museum of Los Angeles County.

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Received: 2016-9-6
Accepted: 2016-11-17
Published Online: 2017-4-3
Published in Print: 2017-4-1

© 2017 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2017-5948
Keywords for this article
Fluorwavellite; new mineral; crystal structure; Raman spectroscopy; infrared spectroscopy; wavellite; Silver Coin mine; Nevada, U.S.A.; Wood mine; Tennessee, U.S.A

Articles in the same Issue

  1. Review: Minerals in the Human Body
  2. Mineral precipitation and dissolution in the kidney
  3. Special Collection: Nanominerals and Mineral Nanoparticles
  4. Luogufengite: A new nano-mineral of Fe2O3 polymorph with giant coercive field
  5. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  6. Column anion arrangements in chemically zoned ternary chlorapatite and fluorapatite from Kurokura, Japan
  7. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  8. Magmatic graphite inclusions in Mn-Fe-rich fluorapatite of perphosphorus granites (the Belvís pluton, Variscan Iberian Belt)
  9. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  10. Barometric constraints based on apatite inclusions in garnet
  11. Special collection: Olivine
  12. A comparison of olivine-melt thermometers based on DMg and DNi: The effects of melt composition, temperature, and pressure with applications to MORBs and hydrous arc basalts
  13. Special collection: Dynamics of magmatic processes
  14. Water transfer during magma mixing events: Insights into crystal mush rejuvenation and melt extraction processes
  15. Special collection: Rates and depths of magma ascent on earth
  16. A new clinopyroxene-liquid barometer, and implications for magma storage pressures under Icelandic rift zones
  18. The S content of silicate melts at sulfide saturation: New experiments and a model incorporating the effects of sulfide composition
  20. Bond valence and bond energy
  22. Fluvial transport of impact evidence from cratonic interior to passive margin: Vredefort-derived shocked zircon on the Atlantic coast of South Africa
  24. Iron partitioning in natural lower-mantle minerals: Toward a chemically heterogeneous lower mantle
  26. Identifying biogenic silica: Mudrock micro-fabric explored through charge contrast imaging
  28. Compressibility and high-pressure structural behavior of Mg2Fe2O5
  30. Thermo-elastic behavior of grossular garnet at high pressures and temperatures
  32. Experimental constraints on the stability of baddeleyite and zircon in carbonate- and silicate-carbonate melts
  34. Polarized FTIR spectroscopic examination on hydroxylation in the minerals of the wolframite group, (Fe,Mn,Mg)[W,(Nb,Ta)][O,(OH)]4
  36. Tourmaline-rich features in the Heemskirk and Pieman Heads granites from western Tasmania, Australia: Characteristics, origins, and implications for tin mineralization
  38. Ca L2,3-edge near edge X-ray absorption fine structure of tricalcium aluminate, gypsum, and calcium (sulfo)aluminate hydrates
  40. Fluorwavellite, Al3(PO4)2(OH)2F·5H2O, the fluorine analog of wavellite
  42. New Mineral Names
  43. Book Review
  44. Book Review: Geochemical Rate Models: An Introduction to Geochemical Kinetics
  45. Book Review
  46. Book Review: Oxygen: A Four Billion Year History
  47. Erratum
  48. Calibration of Fe XANES for high-precision determination of Fe oxidation state in glasses: Comparison of new and existing results obtained at different synchrotron radiation sources
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