Startseite Charleshatchettite, CaNb4O10(OH)2·8H2O, a new mineral from Mont Saint-Hilaire, Québec, Canada: Description, crystal-structure determination, and origin
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Charleshatchettite, CaNb4O10(OH)2·8H2O, a new mineral from Mont Saint-Hilaire, Québec, Canada: Description, crystal-structure determination, and origin

  • Monika M.M. Haring EMAIL logo und Andrew M. McDonald
Veröffentlicht/Copyright: 30. Oktober 2017
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 102 Heft 11

Abstract

Charleshatchettite, CaNb4O10(OH)2·8H2O, is a new mineral related to franconite and hochelagaite, discovered on a fracture surface of a nepheline syenite at Mont Saint-Hilaire, Québec, Canada. The mineral occurs in white globules (~0.15–0.20 mm in diameter) composed of radiating crystals with individual crystals having average dimensions of ~0.002 × 0.010 × 0.040 mm. Crystals are euhedral, bladed (flattened on [100]), and are transparent to translucent. The mineral is associated with albite, quartz, muscovite, pyrrhotite, pyrite, ancylite-(Ce), and siderite. Charleshatchettite is inferred to be biaxial (−) with α′ = ~1.72(2) and γ′ = ~1.82(2). Data from chemical analyses (SEM-EDS, n = 8): CaO 7.96 (7.04–8.63), MgO 0.24 (0.08–0.78), Al2O3 0.13 (b.d.−0.49), SiO2 1.04 (0.49–1.88), TiO2 3.64 (2.45–5.05), Nb2O5 68.07 (64.83–71.01), and H2O (calc) 22.96, total 104.04 wt% gives the average empirical formula: (Ca1.00Mg0.04)∑1.04(Nb3.62Ti0.32Si0.12Al0.02)∑4.08O10(OH)2⋅8H2O (based on 20 anions). This is similar to that of hochelagaite (CaNb4O11⋅nH2O), although the two are readily distinguished by their powder X-ray diffraction patterns. Results from single-crystal X-ray diffraction analysis give a = 21.151(4), b = 6.496(2), c = 12.714(3) Å, and β = 103.958(3)°, space group C2/c (no. 15). The crystal structure, refined to R = 5.64%, contains 1 Ca site, 2 distorted octahedral Nb sites, and 10 O sites. It consists of clusters of four edge-sharing Nb(O,OH)6 octahedra, linked through shared corners to adjacent clusters, forming layers of Nb(O,OH)6 octahedra. These alternate along [100] with layers composed of Ca(H2O)8 polyhedra, the two being linked together by H-bonding. Charleshatchettite is a late-stage mineral, interpreted to have developed through the interaction of low-T (<150 °C) aqueous fluids with an alkali-, Nb-rich precursor under slightly reducing conditions and a highly alkaline pH. The precursor mineral(s) is unknown but is considered to have been Nb-dominant, relatively unstable under slightly reducing as well as alkaline conditions, and likely itself would have been a product of near-complete Nb/Ta fractionation due to the paucity of Ta in charleshatchettite. Charleshatchettite is crystallochemically related to Sandia Octahedral Molecular Sieves [SOMS; Na2Nb2–xMxO6–x(OH)x⋅H2O with M = Ti, Zr, Hf], a group of synthetic compounds with strong ion exchange capabilities.

Keywords: New mineral; charleshatchettite; Mont Saint-Hilaire; SOMS; hochelagaite; franconite; Nb/Ta fractionation; crystal structure

Acknowledgments

Our thanks to F.C. Hawthorne (Department of Geological Sciences, University of Manitoba) for providing access to the four-circle diffractometer and to Mark C. Cooper for providing assistance with the single-crystal XRD data collection. In addition, we thank Joy Gray-Munro (Department of Chemistry and Biochemistry, Laurentian University) for providing access to the infrared spectrometer as well as assistance with the data collection. We also acknowledge the comments made by Anthony Kampf and those of the associate editor, Beda Hofmann. Financial support for this research was provided through a grant to A.M.M. from the Natural Sciences and Engineering Research Council as well as an Alexander Graham Bell Canada Graduate Scholarship to M.M.M.H. also from the Natural Sciences and Engineering Research Council.

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Received: 2016-8-2
Accepted: 2017-6-29
Published Online: 2017-10-30
Published in Print: 2017-11-27

© 2017 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.2138/am-2017-5926
Schlagwörter für diesen Artikel
New mineral; charleshatchettite; Mont Saint-Hilaire; SOMS; hochelagaite; franconite; Nb/Ta fractionation; crystal structure

Artikel in diesem Heft

  1. Highlights and Breakthroughs
  2. Rutile: A novel recorder of high-fo2 fluids in subduction zones
  3. Highlights and Breakthroughs
  4. Granites and rhyolites: Messages from Hong Kong, courtesy of zircon
  5. Review
  6. Do Fe-Ti-oxide magmas exist? Probably not!
  7. Special Collection: Biomaterials—Mineralogy Meets Medicine
  8. Calcium (Ti,Zr) hexaorthophosphate bioceramics for electrically stimulated biomedical implant devices: A position paper
  9. Special Collection: Water in Nominally Hydrous and Anhydrous Minerals
  10. Raman spectroscopy of water-rich stishovite and dense high-pressure silica up to 55 GPa
  12. Tracking the evolution of Late Mesozoic arc-related magmatic systems in Hong Kong using in-situ U-Pb dating and trace element analyses in zircon
  14. Defect contributions to the heat capacities and stabilities of some chain, ring, and sheet silicates, with implications for mantle minerals
  16. Phase transition in SiC from zinc-blende to rock-salt structure and implications for carbon-rich extrasolar planets
  18. Non-destructive, multi-method, internal analysis of multiple inclusions in a single diamond: First occurrence of mackinawite (Fe,Ni)1+xS
  20. The fate of ammonium in phengite at high temperature
  22. Parameterized lattice strain models for REE partitioning between amphibole and silicate melt
  24. Unusual replacement of Fe-Ti oxides by rutile during retrogression in amphibolite-hosted veins (Dabie UHP terrane): A mineralogical record of fluid-induced oxidation processes in exhumed UHP slabs
  26. Crystallization experiments in rhyolitic systems: The effect of temperature cycling and starting material on crystal size distribution
  28. Dolomite dissociation indicates ultra-deep (>150 km) subduction of a garnet-bearing dunite block (the Sulu UHP terrane)
  30. Microscopic strain in a grossular-pyrope solution anti-correlates with excess volume through local Mg-Ca cation arrangement, more strongly at high Ca/Mg ratio
  32. Ferruginous seawater facilitates the transformation of glauconite to chamosite: An example from the Mesoproterozoic Xiamaling Formation of North China
  34. Charleshatchettite, CaNb4O10(OH)2·8H2O, a new mineral from Mont Saint-Hilaire, Québec, Canada: Description, crystal-structure determination, and origin
  36. New Mineral Names
  38. Erratum
  39. Book Review
  40. Non-Traditional Stable Isotopes
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