Startseite Yangite, PbMnSi3O8·H2O, a new mineral species with double wollastonite silicate chains, from the Kombat mine, Namibia
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Yangite, PbMnSi3O8·H2O, a new mineral species with double wollastonite silicate chains, from the Kombat mine, Namibia

  • Robert T. Downs , William W. Pinch , Richard M. Thompson EMAIL logo , Stanley H. Evans und Lauren Megaw
Veröffentlicht/Copyright: 29. Oktober 2016
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 101 Heft 11

Abstract

A new chain-silicate mineral species, yangite, ideally PbMnSi3O8·H2O, has been found on a specimen from the Kombat mine, Otavi Valley, Namibia. Associated minerals are melanotekite and rhodochrosite.Yangite is colorless to pale brown in transmitted light, transparent with white streak and vitreous luster.Broken pieces of yangite crystals are bladed or platy, and elongated along [010]. It is sectile with a Mohs hardness of ~5; cleavage is perfect on {101} and no twinning or parting was observed. The measured and calculated densities are 4.14(3) and 4.16 g/cm3, respectively. Optically, yangite is biaxial (-), with nα = 1.690(1), nβ = 1.699(1), nγ = 1.705(1), Y = b, Z ˄ c = 11°, and 2Vmeas = 77(2)°. It is insoluble in water, acetone, and hydrochloric acid. An electron microprobe analysis demonstrated that the sample was relatively pure, yielding the empirical formula (with calculated H2O) Pb1.00Mn1.002+Si3.00O8·H2O.Yangite is triclinic and exhibits space group symmetry P1¯ with unit-cell parameters a = 9.6015(9), b = 7.2712(7), c = 7.9833(8) Å, α = 105.910(4), β = 118.229(4), γ = 109.935(5)°, and V = 392.69(7) Å3.Its crystal structure is based on a skeleton of double wollastonite SiO4 tetrahedral chains oriented parallel to [010] and interlinked with ribbons of Mn- and Pb-polyhedra. Yangite represents the first chain silicate with two-connected double chains and possesses all of the structural features of a hypothetical triclinic Ca2Si3O8·2H2O phase proposed by Merlino and Bonaccorsi (2008)as a derivative of the okenite structure. The difference in the H2O component between the hypothetical phase and yangite likely is a consequence of the larger Pb2+ with its lone-pair electrons in yangite replacing the smaller Ca2+ in the hypothetical phase.

Keywords: Yangite; chain silicate; wollastonite chains; crystal structure; X-ray diffraction; Raman spectra

Acknowledgments

This study was funded by Science Foundation Arizona. We are grateful to Stefano Merlino for providing us with his unpublished data and Ajit Thakkar for providing us with his electron wave functions. We also thank Merlino and two anonymous reviewers, along with Associate Editor Fernando Colombo, for their comments, which have improved the quality of this manuscript.

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Received: 2016-1-13
Accepted: 2016-7-6
Published Online: 2016-10-29
Published in Print: 2016-11-1

© 2016 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2016-5682
Schlagwörter für diesen Artikel
Yangite; chain silicate; wollastonite chains; crystal structure; X-ray diffraction; Raman spectra

Artikel in diesem Heft

  1. Highlights and Breakthroughs
  2. Melts, mush, and more: Evidence for the state of intermediate-to-silicic arc magmatic systems
  3. Investigating petrologic indicators of magmatic processes in volcanic rocks
  4. Nucleation rates of spherulites in natural rhyolitic lava
  5. Review
  6. Silicic magma reservoirs in the Earth’s crust
  7. Special Collection: New Advances in Subduction Zone Magma Genesis
  8. Petrogenesis of antecryst-bearing arc basalts from the Trans-Mexican Volcanic Belt: Insights into along-arc variations in magma-mush ponding depths, H2O contents, and surface heat flux
  9. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  10. Wayneburnhamite, Pb9Ca6(Si2O7)3(SiO4)3, an apatite polysome: The Mn-free analog of ganomalite from Crestmore, California
  11. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  12. U-Pb LA-ICP-MS dating of apatite in mafic rocks: Evidence for a major magmatic event at the Devonian-Carboniferous boundary in the Armorican Massif (France)
  13. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  14. Quantification of CO2 concentration in apatite
  15. Special Collection: Apatite: a Common Mineral, Uncommonly Versatile
  16. Phosphate minerals in the H group of ordinary chondrites, and fluid activity recorded by apatite heterogeneity in the Zag H3-6 regolith breccia
  17. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  18. In situ elemental and isotopic analysis of fluorapatite from the Taocun magnetite-apatite deposit, Eastern China: Constraints on fluid metasomatism
  19. Special Collection: Geology and Geobiology of Lassen Volcanic National Park
  20. Acido-thermotolerant fungi from Boiling Springs Lake, LVNP: Potential for lignocellulosic biofuels
  21. Research Article
  22. Solid solution along the synthetic LiAISi2O6-LiFeSi2O6 (spodumene-ferri-spodumene) join: A general picture of solid solutions, bond lengths, lattice strains, steric effects, symmetries, and chemical compositions of Li clinopyroxenes
  23. Research Article
  24. Formation of hydrous stishovite from coesite in high-pressure hydrothermal environments
  25. Research Article
  26. Raman characterization of synthetic magnesian calcites
  27. Research Article
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  29. Research Article
  30. Ideal wollastonite and the structural relationship between the pyroxenoids and pyroxenes
  31. Research Article
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  33. Research Article
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  35. Research Article
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  39. Book Review
  40. Book Review: Highly Siderophile and Strongly Chalcophile Elements in High-Temperature Geochemistry and Cosmochemistry, RIMG Volume 81
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