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Native tungsten from the Bol'shaya Pol'ya river valley and Mt Neroyka, Russia

Published online by Cambridge University Press:  26 January 2021

Stuart J. Mills*
Affiliation:
Geosciences, Museums Victoria, GPO Box 666, Melbourne 3001, Victoria, Australia
Pavel M. Kartashov
Affiliation:
Institute of Geology Ore Deposits, Petrography, Mineralogy and Geochemistry (IGEM) of Russian Academy of Sciences, Staromonetnyi pereulok 35, 109017 Moscow, Russia
Anthony R. Kampf
Affiliation:
Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, USA
Mike S. Rumsey
Affiliation:
Earth Sciences Department, Natural History Museum, Cromwell Road, London SW7 5BD, UK
Chi Ma
Affiliation:
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA
Chris J. Stanley
Affiliation:
Earth Sciences Department, Natural History Museum, Cromwell Road, London SW7 5BD, UK
John Spratt
Affiliation:
Department of Core Research Laboratories, Natural History Museum, Cromwell Road, London SW7 5BD, UK
George R. Rossman
Affiliation:
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA
Margarita I. Novgorodova
Affiliation:
Fersman Mineralogical Museum, Leninskiy Prospekt 18(2), Moscow 117071, Russia
*
*Author for correspondence: Stuart J. Mills, Email: smills@museum.vic.gov.au

Abstract

Native tungsten (IMA2011-004), W, is officially described as a new mineral from gold placers in the Bol'shaya Pol'ya river valley, Prepolar Urals, Russia, associated with yttriaite-(Y) and from quartz veins in the Mt Neroyka rock-crystal field, Ust–Puiva, Tyumenskaya Oblast', Russia. Tungsten forms polycrystalline grains and masses, and rarely cubo-octahedra. It is silver white to steel grey in colour, with metallic lustre and grey streak. The calculated density is 19.226 g/cm3. The Vickers hardness (VHN25) is 571.45 kg/mm2. In plane polarised light, tungsten is white with a pale-yellow tint and optically isotropic. Electron microprobe analyses of Bol'shaya Pol'ya river valley material provided W 99.27, Mo 0.06, Mn 0.04, Fe 0.01, total 99.38 wt.%. The five strongest powder X-ray diffraction lines are [dobs Å(I)(hkl)]: 2.2422(100)(110), 1.5835(25)(200), 1.2929(48)(211), 1.0010(23)(310) and 0.8457(24)(321). Tungsten is cubic, Im$\bar{3}$m, a = 3.1648(4) Å, V = 31.69(4) Å3 and Z = 2. Some additional occurrences of native tungsten and technogenic tungsten found in Nature are also described.

Information

Type
Article – Frank Reith memorial issue
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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