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Transjordanite, Ni2P, a new terrestrial and meteoritic phosphide, and natural solid solutions barringerite-transjordanite (hexagonal Fe2P–Ni2P)

  • Sergey N. Britvin , Michail N. Murashko , Yevgeny Vapnik , Yury S. Polekhovsky , Sergey V. Krivovichev , Maria G. Krzhizhanovskaya , Oleg S. Vereshchagin ORCID logo , Vladimir V. Shilovskikh ORCID logo and Natalia S. Vlasenko
Published/Copyright: March 1, 2020
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American Mineralogist
From the journal American Mineralogist Volume 105 Issue 3

Abstract

This paper is a first detailed report of natural hexagonal solid solutions along the join Fe2P–Ni2P. Transjordanite, Ni2P, a Ni-dominant counterpart of barringerite (a low-pressure polymorph of Fe2P), is a new mineral. It was discovered in the pyrometamorphic phosphide assemblages of the Hatrurim Formation (the Dead Sea area, Southern Levant) and was named for the occurrence on the Transjordan Plateau, West Jordan. Later on, the mineral was confirmed in the Cambria meteorite (iron ungrouped, fine octahedrite), and it likely occurs in CM2 carbonaceous chondrites (Mighei group). Under reflected light, transjordanite is white with a beige tint. It is non-pleochroic and weakly anisotropic. Reflectance values for four COM recommended wavelengths are [Rmax/Rmin, % (λ, nm)]: 45.1/44.2 (470), 49.9/48.5 (546), 52.1/50.3 (589), 54.3/52.1 (650). Transjordanite is hexagonal, space group P62m; unit-cell parameters for the holotype specimen, (Ni1.72Fe0.27)1.99P1.02, are: a = 5.8897(3), c = 3.3547(2) Å, V = 100.78(1) Å3, Z = 3. Dcalc = 7.30 g/cm3. The crystal structure of holotype transjordanite was solved and refined to R1 = 0.013 based on 190 independent observed [I > 2σ(I)] reflections. The crystal structure represents a framework composed of two types of infinite rods propagated along the c-axis: (1) edge-sharing tetrahedra [M(1)P4] and (2) edge-sharing [M(2)P5] square pyramids. Determination of unit-cell parameters for 12 members of the Fe2P–Ni2P solid-solution series demonstrates that substitution of Ni for Fe in transjordanite and vice versa in barringerite does not obey Vegard’s law, indicative of preferential incorporation of minor substituent into M(1) position. Terrestrial transjordanite may contain up to 3 wt% Mo, whereas meteoritic mineral bears up to 0.2 wt% S.

Keywords: Transjordanite; barringerite; phosphide; Fe-Ni-P system; Fe2P; Ni2P; crystal structure; phase transitions; solid solution; Vegard’s law; pyrometamorphism; meteorite; prebiotic phosphorylation

† Deceased: September 29, 2018.

Acknowledgments

The authors gratefully acknowledge the curators of the Mining Museum, St. Petersburg Mining Institute, for providing the sample of the Cambria meteorite. We are thankful to the Associate Editor, Giacomo Diego Gatta, two anonymous reviewers, and the Technical Editor who contributed significantly to improving the quality of the manuscript.

  1. Funding

    This research was funded by Russian Science Foundation, grant 18-17-00079. The authors thank X‑ray Diffraction Centre, “Geomodel” Resource Centre and Nanophotonics Resoure Centre of St. Petersburg State University for providing instrumental and computational resources.

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Received: 2019-09-03
Accepted: 2019-11-15
Published Online: 2020-03-01
Published in Print: 2020-03-26

© 2020 Walter de Gruyter GmbH, Berlin/Boston

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  2. The distribution and abundance of halogens in eclogites: An in situ SIMS perspective of the Raspas Complex (Ecuador)
  3. Pressure dependence of Si diffusion in γ-Fe
  4. Seismic detectability of carbonates in the deep Earth: A nuclear inelastic scattering study
  5. Equations of state, phase relations, and oxygen fugacity of the Ru-RuO2 buffer at high pressures and temperatures
  6. Experimental determination of the phase relations of Pt and Pd antimonides and bismuthinides in the Fe-Ni-Cu sulfide systems between 1100 and 700 °C
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  11. Textural and compositional evolution of iron oxides at Mina Justa (Peru): Implications for mushketovite and formation of IOCG deposits
  12. Siwaqaite, Ca6Al2(CrO4)3(OH)12·26H2O, a new mineral of the ettringite group from the pyrometamorphic Daba-Siwaqa complex, Jordan
  13. Negevite, the pyrite-type NiP2, a new terrestrial phosphide
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https://doi.org/10.2138/am-2020-7275
Keywords for this article
Transjordanite; barringerite; phosphide; Fe-Ni-P system; Fe2P; Ni2P; crystal structure; phase transitions; solid solution; Vegard’s law; pyrometamorphism; meteorite; prebiotic phosphorylation

Articles in the same Issue

  1. Heavy halogen geochemistry of martian shergottite meteorites and implications for the halogen composition of the depleted shergottite mantle source
  2. The distribution and abundance of halogens in eclogites: An in situ SIMS perspective of the Raspas Complex (Ecuador)
  3. Pressure dependence of Si diffusion in γ-Fe
  4. Seismic detectability of carbonates in the deep Earth: A nuclear inelastic scattering study
  5. Equations of state, phase relations, and oxygen fugacity of the Ru-RuO2 buffer at high pressures and temperatures
  6. Experimental determination of the phase relations of Pt and Pd antimonides and bismuthinides in the Fe-Ni-Cu sulfide systems between 1100 and 700 °C
  7. Layer stacking disorder in Mg-Fe chlorites based on powder X-ray diffraction data
  8. Elasticity of single-crystal Fe-enriched diopside at high-pressure conditions: Implications for the origin of upper mantle low-velocity zones
  9. XANES spectroscopy of sulfides stable under reducing conditions
  10. Zircon and apatite geochemical constraints on the formation of the Huojihe porphyry Mo deposit in the Lesser Xing’an Range, NE China
  11. Textural and compositional evolution of iron oxides at Mina Justa (Peru): Implications for mushketovite and formation of IOCG deposits
  12. Siwaqaite, Ca6Al2(CrO4)3(OH)12·26H2O, a new mineral of the ettringite group from the pyrometamorphic Daba-Siwaqa complex, Jordan
  13. Negevite, the pyrite-type NiP2, a new terrestrial phosphide
  14. Transjordanite, Ni2P, a new terrestrial and meteoritic phosphide, and natural solid solutions barringerite-transjordanite (hexagonal Fe2P–Ni2P)
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