New Data on Tochilinite

Organova, N. I.; Горшков, А. И.; Dikov, Yu. P.; Kul'bachinskiy, V. A.; Laputina, I. P.; Сивцов, А. В.; Sluzhenikin, Sergey F.; Ponomarenko, Arina

doi:10.1080/00206818809466050

Cited by 4 publications

(15 citation statements)

References 5 publications

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“…Furthermore, HRTEM images indicate lattice fringes of 0.54 nm and SAED patterns show strong (002) diffraction spots along the c* axis consistent with tochilinite ( Figs. 8e and 8f) (MacKinnon and Zolensky 1984;Organova et al 1988;Kakos et al 1994). EDX analyses of isolated acicular crystals show that they contain variable concentrations of Fe and O, with the average composition 57.9 AE 9.4 wt% Fe, 18.4 AE 5.7 wt% O, 17.9 AE 1.5 wt% S, 3.9 AE 2 wt% Si, 0.7 AE 0.8 wt% Ca, and 0.6 AE 0.8 wt% Mg (n = 6, 1r errors; Fig.…”

Section: Tochilinite Precipitationmentioning

confidence: 99%

“…Its crystal structure is characterized by alternating brucite/amakinite‐like (Mg,Fe)(OH) 2 and mackinawite‐like (Fe,Ni) 1– x S layers (MacKinnon and Zolensky ; Organova et al. ). Meteoritic tochilinite is believed to form during the first stage of aqueous alteration by the dissolution of Fe‐Ni metal or olivine/pyroxene by S‐ and Fe‐rich fluids (Zolensky and MacKinnon ; Palmer and Lauretta ; Pignatelli et al.…”

Section: Introductionmentioning

confidence: 99%

“…Tochilinite is a hydroxysulfide mineral with the general ideal formula of 2Fe 1-x S Á n(Fe,Mg,Al,Ca)(OH) 2 , where 0.08 ≤ x ≤ 0.28 and 1.58 ≤ n ≤ 1.75 (Zolensky and MacKinnon 1986;Gubaidulina et al 2007). Its crystal structure is characterized by alternating brucite/amakinitelike (Mg,Fe)(OH) 2 and mackinawite-like (Fe,Ni) 1-x S layers (MacKinnon and Zolensky 1984;Organova et al 1988). Meteoritic tochilinite is believed to form during the first stage of aqueous alteration by the dissolution of Fe-Ni metal or olivine/pyroxene by S-and Fe-rich fluids (Zolensky and MacKinnon 1986;Palmer and Lauretta 2011;Pignatelli et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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Deciphering the conditions of tochilinite and cronstedtite formation in CM chondrites from low temperature hydrothermal experiments

Vacher

Truche

Fauré

et al. 2019

Meteorit & Planetary Scien

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Tochilinite/cronstedtite intergrowths are commonly observed as alteration products in CM chondrite matrices, but the conditions under which they formed are still largely underconstrained due to their scarcity in terrestrial environments. Here, we report low temperature (80 °C) anoxic hydrothermal experiments using starting assemblages similar to the constituents of the matrices of the most pristine CM chondrite and S‐rich and S‐free fluids. Cronstedtite crystals formed only in S‐free experiments under circumneutral conditions with the highest Fe/Si ratios. Fe‐rich tochilinite with chemical and structural characteristics similar to chondritic tochilinite was observed in S‐bearing experiments. We observed a positive correlation between the Mg content in the hydroxide layer of synthetic tochilinite and temperature, suggesting that the composition of tochilinite is a proxy for the alteration temperature in CM chondrites. Using this relation, we estimate the mean precipitation temperatures of tochilinite to be 120–160 °C for CM chondrites. Given the different temperature ranges of tochilinite and cronstedtite in our experiments, we propose that Fe‐rich tochilinite crystals resulted from the alteration of metal beads under S‐bearing alkaline conditions at T = 120–160 °C followed by cronstedtite crystals formed by the reaction of matrix amorphous silicates, metal beads, and water at a low temperature (50–120 °C).

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Section: Tochilinite Precipitationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Deciphering the conditions of tochilinite and cronstedtite formation in CM chondrites from low temperature hydrothermal experiments

Vacher

Truche

Fauré

et al. 2019

Meteorit & Planetary Scien

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“…Tochilinite is composed of the alternating stacking of mackinawite-like Fe1−xS layer and metal hydroxide layer with brucite-like structure. [16][17][18] In tochilinite, the lattices of mackinawite-like tetragonal Fe1−xS and hexagonal metal hydroxide is quasi-commensurate. [16][17][18] The mackinawite-like Fe1−xS layer is formed by the edge-shared FeS4 tetrahedra, which is considered to carry negative charges due to the Fe vacancies in the Fe1−xS layer.…”

Section: Introductionmentioning

confidence: 99%

“…[16][17][18] In tochilinite, the lattices of mackinawite-like tetragonal Fe1−xS and hexagonal metal hydroxide is quasi-commensurate. [16][17][18] The mackinawite-like Fe1−xS layer is formed by the edge-shared FeS4 tetrahedra, which is considered to carry negative charges due to the Fe vacancies in the Fe1−xS layer. The metal hydroxide layer is formed by the edge-shared M(OH)6 octahedra, which is considered to carry positive charges.…”

Section: Introductionmentioning

confidence: 99%

Superconductivity at 40 K in Lithiation-Processed [(Fe,Al)(OH)₂][FeSe]_1.2 with a Layered Structure

Shi

Wang

et al. 2021

Inorg. Chem.

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Exploration of new superconductors has always been one of the research directions in condensed matter physics. We report here a new layered heterostructure of [(Fe,Al)(OH)2][FeSe]1.2, which is synthesized by the hydrothermal ion-exchange technique. The structure is suggested by a combination of X-ray powder diffraction and the electron diffraction (ED).[(Fe,Al)(OH)2][FeSe]1.2 is composed of the alternating stacking of tetragonal FeSe layer and hexagonal (Fe,Al)(OH)2 layer. In [(Fe,Al)(OH)2][FeSe]1.2, there exists mismatch between the FeSe sub-layer and (Fe,Al)(OH)2 sub-layer, and the lattice of the layered heterostructure is quasi-commensurate. The as-synthesized [(Fe,Al)(OH)2][FeSe]1.2 is non-superconducting due to the Fe vacancies in the FeSe layer. The superconductivity with a Tc of 40 K can be achieved after a lithiation process, which is due to the elimination of the Fe vacancies in the FeSe layer. The Tc is nearly the same as that of (Li,Fe)OHFeSe although the structure of [(Fe,Al)(OH)2][FeSe]1.2 is quite different from that of (Li,Fe)OHFeSe. The new layered heterostructure of [(Fe,Al)(OH)2][FeSe]1.2 contains an iron selenium tetragonal lattice interleaved with a hexagonal metal hydroxide lattice. These results indicate that the superconductivity is very robust for FeSe-based superconductors. It opens a path for exploring superconductivity in iron-base superconductors.

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Brucite-driven CO2 uptake in serpentinized dunites (Ligurian Ophiolites, Montecastelli, Tuscany)

Boschi

Dini

Baneschi

et al. 2017

Lithos

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New Data on Tochilinite

Cited by 4 publications

References 5 publications

Deciphering the conditions of tochilinite and cronstedtite formation in CM chondrites from low temperature hydrothermal experiments

Deciphering the conditions of tochilinite and cronstedtite formation in CM chondrites from low temperature hydrothermal experiments

Superconductivity at 40 K in Lithiation-Processed [(Fe,Al)(OH)₂][FeSe]_1.2 with a Layered Structure

Brucite-driven CO2 uptake in serpentinized dunites (Ligurian Ophiolites, Montecastelli, Tuscany)

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New Data on Tochilinite

Cited by 4 publications

References 5 publications

Deciphering the conditions of tochilinite and cronstedtite formation in CM chondrites from low temperature hydrothermal experiments

Deciphering the conditions of tochilinite and cronstedtite formation in CM chondrites from low temperature hydrothermal experiments

Superconductivity at 40 K in Lithiation-Processed [(Fe,Al)(OH)2][FeSe]1.2 with a Layered Structure

Brucite-driven CO2 uptake in serpentinized dunites (Ligurian Ophiolites, Montecastelli, Tuscany)

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Product

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Superconductivity at 40 K in Lithiation-Processed [(Fe,Al)(OH)₂][FeSe]_1.2 with a Layered Structure