Gospodarka Surowcami Mineralnymi - Mineral Resources Management

Bielowicz, Barbara

doi:10.24425/gsm.2020.132561

2020

DOI: 10.24425/gsm.2020.132561

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Gospodarka Surowcami Mineralnymi - Mineral Resources Management

Barbara Bielowicz

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2022

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Vanadium carbides in shungite

Kovalevski

Moshnikov

2022

Eur. J. Mineral.

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Abstract. Four types of shungite rocks containing 98.2 wt %, 22.2 wt %, 21.6 wt % and 22.4 wt % C and 416, 311, 78 and 182 ppm V were studied, while the ash from these samples contained 23120, 400, 100 and 234 ppm V, respectively. The presence of two vanadium carbides, V2C and V6C5, in samples of shungite with a content of 98.2 wt % C has been revealed by energy dispersive spectroscopy (EDS) and selected-area electron diffraction (SAED). The vanadium carbides revealed are monocrystalline and encapsulated in a carbon shell and thus are the first well-crystallized natural examples of V carbides. The shungite-bearing rocks are Lower Proterozoic in age (2.0–2.1 Ga), and the encapsulation of vanadium carbides in carbon shells explains their good preservation during this time. Parageneses of vanadium carbide and roscoelite have also been found, indicating that roscoelite in shungite rocks may be a secondary mineral formed during the decomposition of vanadium carbide. It is possible that the decomposition of vanadium carbides due to the destruction of carbon shells with the formation of roscoelite occurred during the 1.8 Ga Svecofennian orogeny when the sediments were affected by greenschist-facies metamorphism. Particles encapsulated in carbon shells were also revealed in the shungite rock containing 22.2 wt % C and 311 ppm V, for which high shielding effectiveness is observed in a wide frequency range.

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Vanadium carbides in shungite

Kovalevski

Moshnikov

2022

Eur. J. Mineral.

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Gospodarka Surowcami Mineralnymi - Mineral Resources Management

Cited by 1 publication

References 21 publications

Vanadium carbides in shungite

Vanadium carbides in shungite

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