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Wassonite: A new titanium monosulfide mineral in the Yamato 691 enstatite chondrite

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Published/Copyright: April 2, 2015
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American Mineralogist
From the journal American Mineralogist Volume 97 Issue 5-6

Abstract

Wassonite, ideally stoichiometric TiS, is a titanium monosulfide not previously observed in nature, that was discovered within the Yamato 691 EH3 enstatite chondrite. Twelve Ti-S phase grains were identified in a rare barred olivine (BO) chondrule; three of the grains were extracted by the focused ion beam technique. Because of the submicrometer size of the wassonite grains, it was not possible to determine conventional macroscopic properties. However, the chemical composition and crystal structure were well constrained by extensive quantitative energy-dispersive X-ray analysis and electron diffraction using transmission electron microscopy (TEM). The crystal system for wassonite is rhombohedral (a = 3.42 ± 0.07, c = 26.50 ± 0.53 Å) with space group: R3̅m, cell volume: 268.4 ± 0.53 Å3, Z = 9, density (calculated): 4.452 g/cm3, empirical formula: (Ti0.93,Fe0.06,Cr0.01)S. The wassonite grains crystallized from the chondrule melt that was itself formed in the solar nebula, not on the parent asteroid. The other crystalline phases in the BO chondrule include forsterite, enstatite, troilite, metallic Fe-Ni, and osbornite (as well as the new Ti-S-bearing minerals and schollhornite) are highly reduced and indicate formation at low-oxygen fugacities.

Keywords: New mineral; wassonite; TiS; Antarctic meteorite; TEM; electron diffraction
Received: 2011-7-12
Accepted: 2012-1-4
Published Online: 2015-4-2
Published in Print: 2012-5-1

© 2015 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am.2012.3946
Keywords for this article
New mineral; wassonite; TiS; Antarctic meteorite; TEM; electron diffraction

Articles in the same Issue

  1. Dana medal lecture: Tilts and tetrahedra: The origin of the anisotropy of feldspars
  2. Amorphous Materials: Determination of water content in silicate glasses using Raman spectrometry: Implications for the study of explosive volcanism
  3. Density functional calculations of the enthalpies of formation of rare-earth orthophosphates
  4. U-Pb ID-TIMS dating applied to U-rich inclusions in garnet
  5. Wassonite: A new titanium monosulfide mineral in the Yamato 691 enstatite chondrite
  6. Determination of Mn valence states in mixed-valent manganates by XANES spectroscopy
  7. The morphology of the reaction front of the dissolutionprecipitation reaction rutile + wollastonite = titanite in time series experiments at 600 °C/400 MPa
  8. Precipitation of rutile and ilmenite needles in garnet: Implications for extreme metamorphic conditions in the Acadian Orogen, U.S.A.
  9. The genesis of mantle-derived sapphirine
  10. Experimental investigation of smectite interaction with metal iron at 80 °C: Structural characterization of newly formed Fe-rich phyllosilicates
  11. High-pressure study of a natural cancrinite
  12. Investigation of cation ordering in triclinic sodium birnessite via 23Na MAS NMR spectroscopy
  13. The dual behavior of the β-As4S4 altered by light
  14. Pressure-induced changes in local electronic structures of SiO2 and MgSiO3 polymorphs: Insights from ab initio calculations of O K-edge energy-loss near-edge structure spectroscopy
  15. Structural stability, cation ordering, and local relaxation along the AlNbO4-Al0.5Cr0.5NbO4 join
  16. Europium oxidation state and local structure in silicate glasses
  17. Kinetics of partial dehydroxylation in dioctahedral 2:1 layer clay minerals
  18. Determination of Fe3+/Fe using the electron microprobe: A calibration for amphiboles
  19. Characterization of smectite to NH4-illite conversion series in the fossil hydrothermal system of Harghita Bãi, East Carpathians, Romania
  20. Allanite-(Nd), CaNdAl2Fe2+(SiO4)(Si2O7)O(OH), a new mineral from Åskagen, Sweden
  21. Tsilaisite, NaMn3Al6(Si6O18)(BO3)3(OH)3OH, a new mineral species of the tourmaline supergroup from Grotta d’Oggi, San Pietro in Campo, island of Elba, Italy
  22. Letter. A nanoscopic approach to the kinetics of anhydrite (100) surface growth in the range of temperatures between 60 and 120 °C
  23. Letter. High-pressure phase transitions in Ca-Mn carbonates (Ca,Mn)CO3 studied by Raman spectroscopy
  24. Letter. Actinides in Geology, Energy, and the Environment: Thermally induced transformation of vorlanite to “protovorlanite”: Restoration of cation ordering in self-irradiated CaUO4
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