Murashkoite, FeP, a new terrestrial phosphide from pyrometamorphic rocks of the Hatrurim Formation, South Levant

Britvin, Sergey N.; Vapnik, Yevgeny; Polekhovsky, Yury S.; Krivovichev, Sergey V.; Krzhizhanovskaya, Maria G.; Gorelova, Liudmila A.; Vereshchagin, Oleg S.; Shilovskikh, Vladimir V.; Zaitsev, Anatoly N.

doi:10.1007/s00710-018-0647-y

Cited by 28 publications

(16 citation statements)

References 64 publications

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“…5b). Recently, a natural analog of FeP phase, muraskoite, has been described in pyrometamorphic rocks of the Hatrurim Formation 31 . Using the scanning electron microscopy, we have determined Fe 2 P with a minor amount of FeP-murashkoite and, besides, rare grains of Fe 3 P-schreibersite (Fig.…”

Section: Resultsmentioning

confidence: 99%

(Fe,Ni)2P allabogdanite can be an ambient pressure phase in iron meteorites

Litasov

Bekker

Sagatov

et al. 2020

Sci Rep

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An orthorhombic modification of (Fe,Ni) 2 P, allabogdanite, found in iron meteorites was considered to be thermodynamically stable at pressures above 8 GPa and temperatures of 1673 K according to the results of recent static high-pressure and high-temperature experiments. A hexagonal polymorphic modification of (Fe,Ni) 2 P, barringerite, was considered to be stable at ambient conditions. Experimental investigation through the solid-state synthesis supported by ab initio calculations was carried out to clarify the stability fields of (Fe,Ni) 2 P polymorphs. Both experimental and theoretical studies show that fe 2 P-allabogdanite is a low-temperature phase stable at ambient conditions up to a temperature of at least 773 K and, therefore, is not necessarily associated with high pressures. This is consistent with the textural relationships of allabogdanite in iron meteorites. Fe 2 P plays a substantial role in the mineralogy of iron meteorites. Two polymorphic modifications of Fe 2 P−Ni 2 P solid-solution currently known are hexagonal barringerite (C22) 1,2 and orthorhombic allabogdanite (C23) 3,4. Barringerite was discovered in the Ollague pallasite found in Bolivia 1. The composition determined by electron probe microanalysis was (Fe 0.58 Ni 0.42 Co 0.003) 1.95 P. It is isostructural with the hexagonal modification of Fe 2 P with lattice parameters a = 5.87(7) Å and c = 3.44(4) Å. In a short time after its discovery, it was shown that the Ollague meteorite is a fragment of a very large, up to several hundred kilograms, Imilac pallasite, the numerous fragments of which were found in the province of Antofagasta, Chile. It turned out that the Ollague meteorite was artificially reheated, which could cause high-temperature changes in the chemical and mineral compositions 5. It is noteworthy that barringerite has never been observed in other fragments of the Imilac meteorite or other investigated pallasites. Some barringerite findings are associated with placers 6 , but their sources are probably cosmogenic 2. Detailed mineralogical and crystal-chemical characterization of terrestrial barringerite from pyrometamorphic rocks of the Hatrurim formation, Israel is reported by Britvin et al. 2. The mineral occurs in associations of the so-called «paralavas» − initially silicate-carbonate sedimentary rocks that remelted during pyrometamorphic processes at about 1300 K, but under low pressure. Barringerite from the Hatrurim formation is almost pure Fe 2 P, the exact composition is (Fe 1.95 Ni 0.03 Cr 0.02) 2.00 P. The unit cell parameters determined by single crystal X-ray diffraction are a = 5.867(1) Å and c = 3.464(1) Å with Z = 3. The orthorhombic modification of Fe 2 P−Ni 2 P solid-solution, allabogdanite was first detected in anomalous Onello high-Ni ataxite found in 1997 in the alluvium of the Onello River, Yakutia, Russia 3. Earlier this mineral in the Onello ataxite was considered barringerite 7-9. The unit cell parameters of allabogdanite refined from single-crystal data are a = 5.792(7) Å, b = 3.564(4) Å, and c = 6.69...

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Section: Resultsmentioning

confidence: 99%

(Fe,Ni)2P allabogdanite can be an ambient pressure phase in iron meteorites

Litasov

Bekker

Sagatov

et al. 2020

Sci Rep

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“…Production of molecular oxide species (i.e., 232 Th 16 O/ 232 Th) was maintained at <0.2%. The monitored isotopes included 51 V, 53 Cr, 55 Mn, 57 Fe, 59 Co, 60 Ni, 65 Cu, 66 Zn, 69 Ga, 72 Ge, 75 As, 77 Se, 95 Mo, 107 Ag, 111 Cd, 115 In, 118 Sn, 121 Sb, 125 Te, 197 Au, 202 Hg, 205 Tl, 208 Pb, and 209 Bi. The element contents were calibrated against reference materials of USGS MASS-1 and USGS GSD-1g using 66 Zn as an internal standard for sphalerite and würtzite, and 57 Fe for pyrite, respectively [43,44].…”

Section: Methodsmentioning

confidence: 99%

Ultrahigh-Temperature Sphalerite from Zn-Cd-Se-Rich Combustion Metamorphic Marbles, Daba Complex, Central Jordan: Paragenesis, Chemistry, and Structure

et al. 2020

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Minerals of the Zn-Cd-S-Se system that formed by moderately reduced ~800–850 °C combustion metamorphic (CM) alteration of marly sediments were found in marbles from central Jordan. Their precursor sediments contain Se- and Ni-enriched authigenic pyrite and ZnS modifications with high Cd enrichment (up to ~10 wt%) and elevated concentrations of Cu, Sb, Ag, Mo, and Pb. The marbles are composed of calcite, carbonate-fluorapatite, spurrite, and brownmillerite and characterized by high P, Zn, Cd, U, and elevated Se, Ni, V, and Mo contents. Main accessories are either Zn-bearing oxides or sphalerite, greenockite, and Ca-Fe-Ni-Cu-O-S-Se oxychalcogenides. CM alteration lead to compositional homogenization of metamorphic sphalerite, for which trace-element suites become less diverse than in the authigenic ZnS. The CM sphalerites contain up to ~14 wt% Cd and ~6.7 wt% Se but are poor in Fe (means 1.4–2.2 wt%), and bear 100–250 ppm Co, Ni, and Hg. Sphalerite (Zn,Cd,Fe)(S,O,Se)cub is a homogeneous solid solution with a unit cell smaller than in ZnScub as a result of S2− → O2− substitution (a = 5.40852(12) Å, V = 158.211(6) Å3). The amount of lattice-bound oxygen in the CM sphalerite is within the range for synthetic ZnS1−xOx crystals (0 < x ≤ 0.05) growing at 900 °C.

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“…These properties are similar to those of meteoritic allabogdanite (Britvin et al 2002) and make allabogdanite optically indistinguishable from barringerite (Figure 3, 4). The peripheral parts of allabogdanite (and barringerite) grains are commonly corroded and replaced by the rims of murashkoite, FeP (Britvin et al 2019c) (Figure 4).…”

Section: Occurrence Of Terrestrial Allabogdanitementioning

confidence: 99%

Discovery of terrestrial allabogdanite (Fe,Ni)2P, and the effect of Ni and Mo substitution on the barringerite-allabogdanite high-pressure transition

Britvin

Vereshchagin

Shilovskikh

et al. 2021

American Mineralogist

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Minerals formed at high pressures are sensitive indicators of extreme pressure-temperature conditions that occur in nature. The discovery of the high-pressure polymorph of (Fe,Ni) 2 P, allabogdanite in the surficial pyrometamorphic rocks of the Hatrurim Formation (the Mottled Zone) surrounding the Dead Sea basin in Israel is the first terrestrial occurrence of a mineral previously only found in iron meteorites. Stepwise annealing experiments demonstrate that allabogdanite is metastable at ambient pressure and that it irreversibly transforms into its low-pressure polymorph, barringerite, upon heating to 850±50°C. High-pressure high-temperature diamond-anvil cell (DAC) experiments confirm the results of annealing experiments. The DAC data indicate that Hatrurim allabogdanite is metastable below 7.4 GPa, and the low-to high-pressure phase transition (barringerite→allabogdanite) occurs at 25±3 GPa and 1400±100°C. The observed transition pressure of Hatrurim allabogdanite is significantly higher than that of pure synthetic Fe 2 P (8 GPa), due to partial substitution of Fe for Ni (4 wt.%) and Mo (2.5 wt.%). Because the influence of substituting impurities on the conditions of phase transitions can be unexpectedly strong, our findings confirm that caution should be exercised when extrapolating data from experiments on synthetic compounds to natural systems. Based on the discovery of terrestrial allabogdanite (Fe,Ni) 2 P coupled with experiments probing the phase transitions in this natural composition, we contend that terrestrial allabogdanite formed via transformation from barringerite and posit potential scenarios of its formation.

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Murashkoite, FeP, a new terrestrial phosphide from pyrometamorphic rocks of the Hatrurim Formation, South Levant

Cited by 28 publications

References 64 publications

(Fe,Ni)2P allabogdanite can be an ambient pressure phase in iron meteorites

(Fe,Ni)2P allabogdanite can be an ambient pressure phase in iron meteorites

Ultrahigh-Temperature Sphalerite from Zn-Cd-Se-Rich Combustion Metamorphic Marbles, Daba Complex, Central Jordan: Paragenesis, Chemistry, and Structure

Discovery of terrestrial allabogdanite (Fe,Ni)2P, and the effect of Ni and Mo substitution on the barringerite-allabogdanite high-pressure transition

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