Nipalarsite, Ni8Pd3As4, a new platinum-group mineral from the Monchetundra Intrusion, Kola Peninsula, Russia

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F19%3A00000298" target="_blank" >RIV/00025798:_____/19:00000298 - isvavai.cz</a>

Result on the web

<a href="https://www.minersoc.org/minmag.html" target="_blank" >https://www.minersoc.org/minmag.html</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1180/mgm.2019.70" target="_blank" >10.1180/mgm.2019.70</a>

Result language

angličtina

Original language name

Nipalarsite, Ni8Pd3As4, a new platinum-group mineral from the Monchetundra Intrusion, Kola Peninsula, Russia

Original language description

Nipalarsite, Ni8Pd3As4, is a new platinum-group mineral (PGM) discovered in the sulfide-bearing orthopyroxenite of the Monchetundra layered intrusion, Kola Peninsula, Russia (67° 52 '22', 32 °47'60'). Nipalarsite forms anhedral grains (5-80 micrometer in size) in intergrowths with sperrylite, kotulskite, hollingworthite, isomertieite, menshikovite, palarstanide, nielsenite and monchetundtraite enclosed in pentlandite, anthophillite, actinolite and chlorite. Nipalarsite is brittle, has a metallic lustre and a grey streak. In plane-polarized light, nipalarsite is light gray with a blue tinge. Reflectance values in air (in percent) are: 50.64 at 589nm, 46.06 at 470nm. 54.12 at 650nm and 48.74 at 546nm. Values of VHN20 fall between 400.5 and 449.2 kg mm–2, with a mean value of 429.9 kg mm–2, corresponding to a Mohs hardness of ∼4. The average result of 27 electron microprobe WDS analyses of natural nipalarsite is (in wt.percent): Ni 44.011, Pd 28.74, Fe0.32, Cu 0.85, Pt 0.01, Au 0.05, As 25.42, Sb 0.05, Te 0.39, total 99.85. The empirical formula (normalized to 15 apfu) is: (Ni8.10Fe0.06)sigma8.16 (Pd2.94Cu0.18)sigma3.12 (As3.68Te0.03)sigma3.71 or, ideally, Ni8Pd3As4. Nipalarsite is cubic, space group Fm m, with a 11.4428(9) angstroem, V 1498.3(4) angstroem3, Z = 8. The strongest lines in the X-ray powder-diffraction pattern of synthetic Ni8Pd3As4 [d in angstroem (I) hkl] are: 2.859(10), 2.623(6), 2.557(6), 2.334(11), 2.201(35), 2.021(100), 1.906(8), 1.429(7). The crystal structure was solved and refined from the single-crystal X-ray-diffraction data of synthetic Ni8Pd3As4. Identity between natural and synthetic nipalarsite is illustrated by an electron backscattered diffraction (EBSD) study of natural nipalarsite. The density calculated on the basis of the empirical formula of nipalarsite is 9.60 g/cm3. The mineral name corresponds to the three main elements: Ni, Pd, and As.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10504 - Mineralogy

Project

<a href="/en/project/GA18-15390S" target="_blank" >GA18-15390S: Experimental and mineralogical study of selected platinum-group chalcogenides and alloys</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Mineralogical Magazine

ISSN

0026-461X

e-ISSN

—

Volume of the periodical

83

Issue of the periodical within the volume

6

Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

837-845

UT code for WoS article

000510232700008

EID of the result in the Scopus database

2-s2.0-85076808204