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Vadlazarenkovite, Pd8Bi1.5Te1.25As0.25, a new mineral isotypic with mertieite from the Konder massif, Far East, Russia

Published online by Cambridge University Press:  11 November 2024

Anatoly V. Kasatkin Open the ORCID record for Anatoly V. Kasatkin [Opens in a new window] ,
Cristian Biagioni Open the ORCID record for Cristian Biagioni [Opens in a new window] ,
Fabrizio Nestola Open the ORCID record for Fabrizio Nestola [Opens in a new window] ,
Atali A. Agakhanov ,
Sergey Yu. Stepanov ,
Vladislav V. Gurzhiy Open the ORCID record for Vladislav V. Gurzhiy [Opens in a new window] ,
Sergey V. Petrov  and
Andrey G. Pilugin
Anatoly V. Kasatkin*
Affiliation:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 18-2, 119071 Moscow, Russia
Cristian Biagioni
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria 53, I-56126 Pisa, Italy
Fabrizio Nestola
Affiliation:
Dipartimento di Geoscienze, Università di Padova, Via Gradenigo 6, I-35131, Padova, Italy
Atali A. Agakhanov
Affiliation:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Leninsky Prospekt 18-2, 119071 Moscow, Russia
Sergey Yu. Stepanov
Affiliation:
South Urals Federal Research Center of Mineralogy and Geoecology UB RAS, 456317, Miass, Chelyabinsk district, Russia
Vladislav V. Gurzhiy
Affiliation:
Institute of Earth Sciences, St. Petersburg State University, University Emb. 7/9, 199034 Saint-Petersburg, Russia
Sergey V. Petrov
Affiliation:
Institute of Earth Sciences, St. Petersburg State University, University Emb. 7/9, 199034 Saint-Petersburg, Russia
Andrey G. Pilugin
Affiliation:
LLC “Nornickel Technical Services”, Grazhgdanskiy Prospekt 11, 195 220, Saint-Petersburg, Russia
*
Corresponding author: Anatoly V. Kasatkin; Email: [email protected]
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Abstract

The new mineral vadlazarenkovite, ideally Pd8Bi1.5Te1.25As0.25, was discovered in a heavy concentrate obtained from ore samples collected at the Anomal’noe occurrence, Konder alkaline-ultrabasic massif, Khabarovsk Krai, Far East, Russia. It occurs as anhedral grains up to 0.15 × 0.15 mm, intergrown with vysotskite and associated with numerous platinum-group element (PGE) bearing minerals (arsenopalladinite, ezochiite, hollingworthite, kotulskite, norilskite, polarite, skaergaardite, sobolevskite, sperrylite, törnroosite, zvyagintsevite etc.). Vadlazarenkovite is grey, opaque with metallic lustre, has brittle tenacity and uneven fracture. No cleavage and parting are observed. The Vickers’ micro-indentation hardness (VHN, 50 g load) is 424 kg/mm2 (range 406–443, n = 4), corresponding to a Mohs’ hardness of 4.5–5. Dcalc. = 11.947 g/cm3. In reflected light, vadlazarenkovite is white with a pale creamy hue. The bireflectance is weak in air and noticeable in oil immersion. In crossed polars the new mineral exhibits distinct anisotropy in grey tones. The reflectance values for wavelengths recommended by the Commission on Ore Mineralogy of the International Mineralogical Association are (Rmin/Rmax, %): 47.2/47.8 (470 nm), 49.1/50.8 (546 nm), 50.7/52.6 (589 nm) and 52.4/54.6 (650 nm). The chemical composition (wt.%, electron microprobe data, mean of 6 analyses) is: Pd 63.67, Ag 2.21, As 1.27, Sb 0.60, Te 11.26, Pb 2.56, Bi 19.95, total 101.51. The empirical formula calculated on the basis of 11 atoms per formula unit is (Pd7.87Ag0.27)Σ8.14(Bi1.26Te1.16As0.22Pb0.16Sb0.06)Σ2.86. Vadlazarenkovite is trigonal, space group R$\bar 3$c, a = 7.7198(2), c = 43.1237(11) Å, V = 2225.66(13) Å3 and Z = 12. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 2.308 (55) (1 1 15); 2.262 (100) (2 0 14); 2.232 (70) (3 0 0); and 2.040 (70) (1 1 18). The crystal structure of vadlazarenkovite was refined to R1 = 0.0267 for 761 reflections with Fo > 4σ(Fo). The new mineral is isotypic with mertieite. It honours Professor Vadim Grigorievich Lazarenkov (1933–2014) for his outstanding contributions to the geology, geochemistry and mineralogy of platinum-group elements.

Keywords

vadlazarenkovitenew mineralplatinum-group elementschemical compositioncrystal structuremertieiteAnomal’noe occurrenceKonder massifRussia
Type
Article
Information
Mineralogical Magazine , First View , pp. 1 - 10
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland.

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Footnotes

Associate Editor: Owen Missen

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