IMA 2019-013 = nazarovite

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Marco E. Ciriotti
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IMA 2019-013 = nazarovite

Messaggio da Marco E. Ciriotti » ven 29 ott, 2021 10:15

Prossima pubblicazione.

Referenza:
▪ Britvin, S.N., Murashko, M.N., Krzhizhanovskaya, M.G., Vereshchagin, O.S., Vapnik, Y., Shilovskikh, V.V., Lozhkin, M.S., Obolonskaya, E.V. (2022): Nazarovite, Ni12P5, a new terrestrial and meteoritic mineral structurally related to nickelphosphide, Ni3P. American Mineralogist, 107, (in press).
Marco E. Ciriotti

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Marco E. Ciriotti
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Re: IMA 2019-013 = nazarovite

Messaggio da Marco E. Ciriotti » gio 06 ott, 2022 12:11

Pubblicazione effettuata.

Referenza:
▪ Britvin, S.N., Murashko, M.N., Krzhizhanovskaya, M.G., Vereshchagin, O.S., Vapnik, Y., Shilovskikh, V.V., Lozhkin, M.S., Obolonskaya, E.V. (2022): Nazarovite, Ni12P5, a new terrestrial and meteoritic mineral structurally related to nickelphosphide, Ni3P. American Mineralogist, 107, 1946-1951.

Abstract:
Nazarovite, Ni12P5, is a new natural phosphide discovered on Earth and in meteorites. Terrestrial nazarovite originates from phosphide assemblages confined to pyrometamorphic suite of the Hatrurim Formation (the Mottled Zone), the Dead Sea basin, Negev desert, Israel. Meteoritic nazarovite was identified among Ni-rich phosphide precipitates extracted from the Marjalahti meteorite (main group pallasite). Terrestrial mineral occurs as micrometer-sized lamella intergrown with transjordanite (Ni2P). Meteoritic nazarovite forms chisel-like crystals up to 8 μm long. The mineral is tetragonal, space group I4/m. The unit-cell parameters of terrestrial and meteoritic material, respectively: a 8.640(1) and 8.6543(3), c 5.071(3), and 5.0665(2) Å, V 378.5(2), and 379.47(3) Å3, Z = 2. The crystal structure of terrestrial nazarovite was solved and refined on the basis of X‑ray single-crystal data (R1 = 0.0516), whereas the structure of meteoritic mineral was refined by the Rietveld method using an X‑ray powder diffraction profile (RB = 0.22%). The mineral is structurally similar to phosphides of schreibersite–nickelphosphide join, Fe3P-Ni3P. Chemical composition of nazarovite (terrestrial/meteoritic, electron microprobe, wt%): Ni 81.87/78.59, Fe <0.2/4.10; Co <0.2/0.07, P 18.16/17.91, total 100.03/100.67, leading to the empirical formula Ni11.97P5.03 and (Ni11.43Fe0.63Co0.01)12.07P4.94, based on 17 atoms per formula unit. Nazarovite formation in nature, both on Earth and in meteorites, is related to the processes of Fe/Ni fractionation in solid state, at temperatures below 1100 °C.
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Marco E. Ciriotti
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Re: IMA 2019-013 = nazarovite

Messaggio da Marco E. Ciriotti » gio 06 ott, 2022 14:07

schreibersite group

Nazarovite Ni12P5 tet I4/m 8.640 8.640 5.071
Nickelphosphide Ni3P tet I4 8.99 8.99 4.396
Schreibersite Fe3P tet I4 9.040 9.040 4.462
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