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Ognitite, NiBiTe, a new mineral species, and Co-rich maucherite from the Ognit ultramafic complex, Eastern Sayans, Russia

Published online by Cambridge University Press:  08 May 2019

Andrei Y. Barkov ,
Luca Bindi ,
Nobumichi Tamura ,
Gennadiy I. Shvedov ,
Björn Winkler ,
Camelia V. Stan ,
Wolfgang Morgenroth ,
Robert F. Martin ,
Federica Zaccarini  and
Christopher J. Stanley
Andrei Y. Barkov*
Affiliation:
Research Laboratory of Industrial and Ore Mineralogy, Cherepovets State University, 5 Lunacharsky Avenue, 162600 Cherepovets, Russia
Luca Bindi
Affiliation:
Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via G. La Pira 4, I-50121 – Firenze, Italy
Nobumichi Tamura
Affiliation:
Advanced Light Source, 1 Cyclotron Road, Lawrence Berkeley National Laboratory, Berkeley, CA 94720-8229, USA
Gennadiy I. Shvedov
Affiliation:
Institute of Mining, Geology and Geotechnology, Siberian Federal University, 95 Avenue Prospekt im. gazety “Krasnoyarskiy Rabochiy”, 660025 Krasnoyarsk, Russia
Björn Winkler
Affiliation:
Inst. f. Geowissenschaften, Universität Frankfurt, Altenhöferallee 1, DE-60438 Frankfurt a. M., Germany
Camelia V. Stan
Affiliation:
Advanced Light Source, 1 Cyclotron Road, Lawrence Berkeley National Laboratory, Berkeley, CA 94720-8229, USA
Wolfgang Morgenroth
Affiliation:
Inst. f. Geowissenschaften, Universität Frankfurt, Altenhöferallee 1, DE-60438 Frankfurt a. M., Germany
Robert F. Martin
Affiliation:
Department of Earth and Planetary Sciences, McGill University, 3450 University Street, Montreal, Quebec H3A 0E8, Canada
Federica Zaccarini
Affiliation:
University of Leoben, Department of Applied Geosciences and Geophysics, Peter Tunner Strasse 5, A-8700 Leoben, Austria
Christopher J. Stanley
Affiliation:
Economic and Environmental Earth Sciences Division, The Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom
*
*Author for correspondence: Andrei Y. Barkov, Email: [email protected]
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Abstract

We describe the new species ognitite, NiBiTe, and a Co-rich variety of maucherite, hitherto unreported; both were discovered in the Ognit ultramafic complex of Neoproterozoic age in Eastern Sayans, Russia. The mean composition of ognitite (n = 7) is: Ni 17.05, Fe 0.07, Cu 0.14, Pd 0.14, Te 32.53, Bi 49.64, total 99.57 wt.%, corresponding to: (Ni1.11Cu0.008Fe0.005Pd0.005)Σ1.13Bi0.90Te0.97 (Σ atoms = 3 apfu). Ognitite is trigonal, space group P3m1 [R1 = 0.0276 for 81 reflections with Fo > 4σ(Fo)]. The unit-cell parameters derived from the single-crystal X-ray diffraction data are: a = 3.928(1) Å, c = 5.385(1) Å and V = 71.95(4) Å3, with Z = 1. The c:a ratio is 1.37. The powder X-ray diffraction data obtained on the same fragment used for the single-crystal study are: a = 3.9332(4) Å, c = 5.3920(6) Å and V = 72.24(1) Å3. Ognitite exhibits the brucite-type structure with edge-sharing NiTe3Bi3 octahedra forming sheets parallel to (0001). It is related to melonite, but is distinct compositionally by the extreme Bi-enrichment (melonite and its synthetic analogue contain <0.4 Bi apfu), and structurally as Bi and Te are ordered at two distinct sites, leading to the loss of the centre of symmetry in ognitite.

At more than 9 wt.% Co, or ~2 apfu Co, the core of Co-rich maucherite [(Ni,Co)11As8] in a zoned crystal, which is surrounded by Co-depleted orcelite, far surpasses the norm (≤1 and up to 3.9 wt.% Co). The unit-cell parameters of the Co-rich maucherite are: a = 6.85(2) and c = 21.83(5) Å, which are based on results of synchrotron micro-Laue diffraction.

The host rock consists of serpentine, clinochlore (Mg# 95–97) and skeletal chromite. We favour the metastable crystallisation of fluid-saturated globules of a sulfide–arsenide melt to explain the anomalous compositions of ore minerals at Ognit. These anomalies seem consistent with rapid cooling in a fluid-enriched system, possibly related to late-stage degassing of the magma, as reflected in a prominent metasomatic aureole at the contact with the enclosing gneissic rocks.

Keywords

ognititeNiBiTenew mineral speciesCo-rich maucheritezonation in arsenidesrapid coolingOgnit complexnickel-cobalt mineralisationultramafic rocksEastern SayansRussia
Type
Article
Information
Mineralogical Magazine , Volume 83 , Issue 5 , October 2019 , pp. 695 - 703
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2019 

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Footnotes

Associate Editor: Irina O Galuskina

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