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Argesite, (NH4)7Bi3Cl16, a new mineral from La Fossa Crater, Vulcano, Aeolian Islands, Italy: A first example of the [Bi2Cl10]4− anion

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Published/Copyright: April 2, 2015
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American Mineralogist
From the journal American Mineralogist Volume 97 Issue 8-9

Abstract

The new mineral argesite, ammonium bismuth chloride (NH4)7Bi3Cl16, was found in a mediumtemperature (~250 °C) active fumarole at La Fossa crater, Vulcano, Aeolian Islands, Sicily, Italy. The mineral occurs on a pyroclastic breccia as pale-yellow crystals up to 0.15 mm in length, in association with bismuthinite, adranosite, brontesite, demicheleite-(Br), demicheleite-(Cl), and panichiite. Argesite is trigonal, space group: R3̅c (no. 167) with Z = 18; the unit-cell parameters are (single-crystal data): a = 13.093(1), c = 102.682(1) Å, and V = 15245(2) Å3. The six strongest reflections in the X-ray powder diffraction pattern are: [dobs(Å) (I) (hkl)] 3.164 (100) (0 3 18), 3.808 (44) (2̅ 2 20), 2.742 (78) (2̅ 4 21), 6.14 (16) (1̅ 2 6), 1.906 (16) (0 0 5̅4̅), 1.686 (13) (5̅ 6 34). The mineral is uniaxial (-), with ω = 1.731(2), ε = 1.725(2) (589 nm). The IR spectrum shows absorptions at 3188(vs), 3060(s), and 1397(vs) cm-1, in agreement with the presence of the ammonium ion. Chemical analyses obtained by EDS electron microprobe gave (average wt%) Bi 42.26, Cl 32.57, Br 13.06, I 0.95, K 2.46, Tl 0.88, NH4 7.82 (by difference) total 100.00, corresponding to the empirical formula: [(NH4)6.29K0.91Tl0.06]Σ7.26Bi2.93(Cl13.33Br2.37I0.11)Σ15.81. The measured density is 2.88(1) g/cm3. The structure was refined, using single-crystal diffraction data, to a final R = 0.0345 for 1289 independent observed reflections [I > 2σ(I)]. It contains Bi2Cl4-10 and BiCl3-6 anions where the Bi atoms are octahedrally coordinated, and NH+4 cations are partially replaced by K+ and Tl+ ions.

Keywords : Argesite; new mineral species; crystal structure; ammonium bismuth chloride; bismuth(III) complexes; sublimates; Vulcano; Italy
Received: 2011-11-17
Accepted: 2012-4-3
Published Online: 2015-4-2
Published in Print: 2012-8-1

© 2015 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am.2012.4052
Keywords for this article
Argesite; new mineral species; crystal structure; ammonium bismuth chloride; bismuth(III) complexes; sublimates; Vulcano; Italy

Articles in the same Issue

  1. Actinides in Geology, Energy, and the Environment. Petrography and geochronology of the Pele Mountain quartz-pebble conglomerate uranium deposit, Elliot Lake District, Canada
  2. Celadonite in continental flood basalts of the Columbia River Basalt Group
  3. Thermodynamics of manganese oxides: Effects of particle size and hydration on oxidation-reduction equilibria among hausmannite, bixbyite, and pyrolusite
  4. Grossular: A crystal-chemical, calorimetric, and thermodynamic study
  5. Redetermination of high-temperature heat capacity of Mg2SiO4 ringwoodite: Measurement and lattice vibrational model calculation
  6. Thermal behavior of realgar As4S4, and of arsenolite As2O3 and non-stoichiometric As8S8+x crystals produced from As4S4 melt recrystallization
  7. Thermodynamics of the magnetite-ulvöspinel (Fe3O4-Fe2TiO4) solid solution
  8. Raman spectroscopy of (Ca,Mg)MgSi2O6 clinopyroxenes
  9. In-situ Raman spectroscopic study of sulfur speciation in oxidized magmatic-hydrothermal fluids
  10. Structural anisotropy and annealing-induced nanoscale atomic rearrangements in metamict titanite
  11. Hydrous fluid as the growth media of natural polycrystalline diamond, carbonado: Implication from IR spectra and microtextural observations
  12. Metastable equilibrium in the C-H-O system: Graphite deposition in crustal fluids
  13. Controlled morphogenesis of amorphous silica and its relevance to biosilicification
  14. Structural relaxation in tetrahedrally coordinated Co2+ along the gahnite-Co-aluminate spinel solid solution
  15. Limitations of Fe2+ and Mn2+ site occupancy in tourmaline: Evidence from Fe2+- and Mn2+-rich tourmaline
  16. Isothermal compression of face-centered cubic iron
  17. Bonding and structural changes in siderite at high pressure
  18. Energetics and kinetics of carbonate orientational ordering in vaterite calcium carbonate
  19. Growth process and crystallographic properties of ammonia-induced vaterite
  20. Argesite, (NH4)7Bi3Cl16, a new mineral from La Fossa Crater, Vulcano, Aeolian Islands, Italy: A first example of the [Bi2Cl10]4− anion
  21. Experimental study of mineral equilibria in the system K2O(Li2O)-Al2O3-SiO2-H2O-HF at 300 to 600 °C and 100 MPa with application to natural greisen systems
  22. Tobelite and NH+4-rich muscovite single crystals from Ordovician Armorican sandstones (Brittany, France): Structure and crystal chemistry
  23. The enigmatic iron oxyhydroxysulfate nanomineral schwertmannite: Morphology, structure, and composition
  24. Ferric iron and water incorporation in wadsleyite under hydrous and oxidizing conditions: A XANES, Mössbauer, and SIMS study
  25. Kircherite, a new mineral of the cancrinite-sodalite group with a 36-layer stacking sequence: Occurrence and crystal structure
  26. Molecular models of birnessite and related hydrated layered minerals
  27. Letter: Gold-telluride nanoparticles revealed in arsenic-free pyrite
  28. Letter: XAS evidence for the stability of polytellurides in hydrothermal fluids up to 599 °C, 800 bar
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