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

Grokhovskaya, T.L.; Karimova, O.V.; Anna, V.; František, L.; Dmitry, C.; Kovalchuk, E.V.; Magazina, L.O.; Rassulov, V.A.

Авторы: Grokhovskaya Tatiana L., Karimova Oxana V., Anna Vymazalová, František Laufek, Dmitry Chareev, Kovalchuk Elena V., Magazina Larisa O., Rassulov Victor A.
Журнал: Mineralogical Magazine
Том: 83
Год издания: 2019
Издательство: Mineralogical Society
Местоположение издательства: United Kingdom
Первая страница: 837
Последняя страница: 845
DOI: 10.1180/mgm.2019.70
Аннотация: Nipalarsite, Ni8Pd3As4, is a new platinum-group mineral discovered in the sulfide-bearing orthopyroxenite of the Monchetundra layered intrusion, Kola Peninsula, Russia. Nipalarsite forms anhedral grains (5–80 µm in size) in intergrowths with sperrylite, kotulskite, hollingworthite, isomertieite, menshikovite, palarstanide, nielsenite and monchetundtraite enclosed in pentlandite, anthophyllite, actinolite and chlorite. Nipalarsite is brittle, has a metallic lustre and a grey streak. In plane-polarised light, nipalarsite is light grey with a blue tinge. Reflectance values in air (in %) are: 50.64 at 589 nm, 46.06 at 470 nm. 54.12 at 650 nm and 48.74 at 546 nm. 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 wavelength dispersive spectroscopy analyses of natural nipalarsite is (wt.%): 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 (normalised to 15 atoms per formula unit) is: (Ni8.10Fe0.06)Σ8.16(Pd2.94Cu0.18)Σ3.12(As3.68Te0.03)Σ3.71 or, ideally, Ni8Pd3As4. Nipalarsite is cubic, space group Fm3m, with a = 11.4428(9) Å, V = 1498.3(4) Å3 and Z = 8. The strongest lines in the powder X-ray diffraction pattern of synthetic Ni8Pd3As4 [d,Å(I) (hkl)] are: 2.021 (100) (044), 2.201 (35) (115, 333), 2.334 (11) (224), 2.859 (10) (004), 1.906 (8) (006, 244), 1.429 (7) (008), 2.623 (6) (313), 2.557 (6) (024). The crystal structure was solved and refined from the single-crystal X-ray diffraction data of synthetic Ni8Pd3As4. The relation between natural and synthetic nipalarsite is illustrated by an electron back-scattered diffraction study of natural nipalarsite. The density calculated on the basis of the empirical formula of nipalarsite is 9.60 g.cm–3. The mineral name corresponds to the three main elements: Ni, Pd and As
Добавил в систему: Чареев Дмитрий Александрович

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

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