Startseite Naturwissenschaften Goldschmidtite, (K,REE,Sr)(Nb,Cr)O3: A new perovskite supergroup mineral found in diamond from Koffiefontein, South Africa
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Goldschmidtite, (K,REE,Sr)(Nb,Cr)O3: A new perovskite supergroup mineral found in diamond from Koffiefontein, South Africa

  • Nicole A. Meyer EMAIL logo , Michelle D. Wenz , James P.S. Walsh , Steven D. Jacobsen , Andrew J. Locock und Jeffrey W. Harris
Veröffentlicht/Copyright: 28. August 2019
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 104 Heft 9

Abstract

Goldschmidtite is a new perovskite-group mineral (IMA No. 2018-034) with the ideal formula (K,REE,Sr)(Nb,Cr)O3. A single grain of goldschmidtite with a maximum dimension of ∼100 μm was found as an inclusion in a diamond from the Koffiefontein pipe in South Africa. In addition to the dark green and opaque goldschmidtite, the diamond contained a Cr-rich augite (websteritic paragenesis) and an intergrowth of chromite, Mg-silicate, and unidentified K-Sr-REE-Nb-oxide. Geothermobarometry of the augite indicates that the depth of formation was ∼170 km. The chemical composition of gold-schmidtite determined by electron microprobe analysis (n = 11, WDS, wt%) is: Nb2O5 44.82, TiO2 0.44, ThO2 0.10, Al2O3 0.35, Cr2O3 7.07, La2O3 11.85, Ce2O3 6.18, Fe2O3 1.96, MgO 0.70, CaO 0.04, SrO 6.67, BaO 6.82, K2O 11.53, total 98.53. The empirical formula (expressed to two decimal places) is (K0.50La0.15Sr0.13Ba0.09Ce0.08)Σ0.95(Nb0.70Cr0.19Fe0.05Al0.01Mg0.04Ti0.01)Σ1.00O3. Goldschmidtite is cubic, space group Pm3m, with unit-cell parameters: a = 3.9876(1) Å, V = 63.404(6) Å3, Z = 1, resulting in a calculated density of 5.32(3) g/cm3. Goldschmidtite is the K-analog of isolueshite, (Na,La)NbO3. Raman spectra of goldschmidtite exhibit many second-order broad bands at 100 to 700 cm–1 as well as a pronounced peak at 815 cm–1, which is possibly a result of local ordering of Nb and Cr at the B site. The name goldschmidtite is in honor of the eminent geochemist Victor Moritz Goldschmidt (1888–1947), who formalized perovskite crystal chemistry and identified KNbO3 as a perovskite-structured compound.

Keywords: Perovskite, niobium; mantle; diamond inclusion; new mineral; Koffiefontein; Kaapvaal

Orcid 0000-0002-8801-6554

Acknowledgments and Funding

The authors thank T. Stachel and D.G. Pearson for their comments and suggestions, which improved the quality of the manuscript. This research was supported in part by the National Research Foundation of South Africa, grant 94626 (N.A. Meyer) and a Natural Sciences and Engineering Research Council (NSERC) Discovery Grant (T. Stachel). S.D. Jacobsen acknowledges support from U.S. National Science Foundation, grant EAR-1853521. J.W.H. thanks the Diamond Trading Company (a member of the DeBeers Group of Companies) for the donation of the diamond used in this study.

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Received: 2018-12-21
Accepted: 2019-06-08
Published Online: 2019-08-28
Published in Print: 2019-09-25

© 2019 Walter de Gruyter GmbH, Berlin/Boston

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  3. Hydrous LABZ beneath a subduction zone was reconstructed for the first time
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  14. Goldschmidtite, (K,REE,Sr)(Nb,Cr)O3: A new perovskite supergroup mineral found in diamond from Koffiefontein, South Africa
  15. Edscottite, Fe5C2, a new iron carbide mineral from the Ni-rich Wedderburn IAB iron meteorite
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https://doi.org/10.2138/am-2019-6937
Schlagwörter für diesen Artikel
Perovskite, niobium; mantle; diamond inclusion; new mineral; Koffiefontein; Kaapvaal

Artikel in diesem Heft

  1. Highlights and Breakthroughs
  2. Seeking the most hydrous, primitive arc melts: The glass is half full
  3. Hydrous LABZ beneath a subduction zone was reconstructed for the first time
  4. U, Th, and K partitioning between metal, silicate, and sulfide and implications for Mercury’s structure, volatile content, and radioactive heat production
  5. Valleyite: A new magnetic mineral with the sodalite-type structure
  6. An analysis of the magnetic behavior of olivine and garnet substitutional solid solutions
  7. Pyrite trace-element and sulfur isotope geochemistry of paleo-mesoproterozoic McArthur Basin: Proxy for oxidative weathering
  8. Compressional behavior and spin state of δ-(Al,Fe)OOH at high pressures
  9. Reconstruction of the lithosphere-asthenosphere boundary zone beneath Ichinomegata maar, Northeast Japan, by geobarometry of spinel peridotite xenoliths
  10. High-pressure phase stability and elasticity of ammonia hydrate
  11. A multi-methodological study of kurnakovite: A potential B-rich aggregate
  12. Identification of the occurrence of minor elements in the structure of diatomaceous opal using FIB and TEM-EDS
  13. Nixonite, Na2Ti6O13, a new mineral from a metasomatized mantle garnet pyroxenite from the western Rae Craton, Darby kimberlite field, Canada
  14. Goldschmidtite, (K,REE,Sr)(Nb,Cr)O3: A new perovskite supergroup mineral found in diamond from Koffiefontein, South Africa
  15. Edscottite, Fe5C2, a new iron carbide mineral from the Ni-rich Wedderburn IAB iron meteorite
  16. Letter
  17. The stability of Fe5O6 and Fe4O5 at high pressure and temperature
  18. New Mineral Names
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