Mössbauerite, Fe6 3+ O4 (OH) 8 [CO3]·3H2O, the fully oxidized green rust mineral from Mont Saint-Michel Bay, France

J. M R Génin, S. J. Mills, A. G. Christy, O. Guérin, A. J. Herbillon, E. Kuzmann, G. Ona-Nguema, C. Ruby, C. Upadhyay

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The new mineral mössbauerite (IMA2012-049), Fe6 3+ O4 (OH) 8 [CO3]·H 2O, is a member of the fougèrite group of the hydrotalcite supergroup. Thus, it has a layered double hydroxide-type structure, in which brucite-like layers [Fe6 3+ O4 (OH) 8]2+ are intercalated with CO3 2- anions and water molecules. Mössbauerite is the fully oxidized analogue of fougèrite and trébeurdenite, related to them chemically by the exchange of (Fe3+O2-) with (Fe2+OH -). Mössbauerite, intimately intergrown with trébeurdenite, was discovered in intertidal gleys from Mont Saint-Michel Bay, France, along with quartz, feldspars and clay minerals. Mössbauerite is formed by the oxidation of the other members of the fougèrite group. Like them, it occurs as mm-scale platelets in gleys with restricted access to atmospheric O and decomposes rapidly when exposed to air. Identification and characterization of these minerals has relied on an electrochemical study of synthetic analogues and Mössbauer spectroscopy, which inspired the name of the new mineral. Unlike fougèrite and trébeurdenite, which are blue-green, pure synthetic mössbauerite is orange in colour. Detailed optical and other physical properties could not be determined because of the small platelet size and instability. The hardness is probably 2-3, by analogy with other members of the supergroup and the density, calculated from unit-cell parameters, is 2.950 g/cm3. Synchrotron X-ray data indicate that the natural material is a nanoscale intergrowth of 2T and 3T polytypes; the latter probably has the 3T7 stacking sequence. The corresponding maximum possible space group symmetries are P3̄m1 and P3m1. Unit-cell parameters for the 3T cell are a = 3.032(7) Å, c = 22.258(4) = 3×7.420 Å and Z = 1/2. Mössbauer spectroscopy at 78 K indicates that two distinct Fe 3+ environments exist in a 2:1 ratio. These are interpreted to be ordered within each layer, but without the development of a threedimensional superlattice. Mössbauerite undergoes gradual magnetic ordering at 70-80 K to a ferromagnetic state, below which it splits into three sextets S 1m, S2m and S3m, as measured at 15 K, and shows the same intensity ratio 1/2:1/6:1/3 as the three doublets for fougèrite D1f, D2f, D3f in the paramagnetic state at 78 K. This suggests that there is also short-range coupling of interlayer carbonate anions with respect to the octahedral layers and that the 2D long-range order of carbonates in interlayers remains unchanged.

Original languageEnglish
Pages (from-to)447-465
Number of pages19
JournalMineralogical Magazine
Volume78
Issue number2
DOIs
Publication statusPublished - 2014

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rust disease
Minerals
hydrotalcite
Carbonates
new mineral
Platelets
Anions
anion
mineral
Magnesium Hydroxide
spectroscopy
Spectroscopy
carbonate
brucite
Quartz
Clay minerals
Synchrotrons
stacking
hardness
hydroxide

Keywords

  • Fougèrite
  • Gleysols
  • Hydrotalcite supergroup
  • Layered double hydroxides
  • Mössbauer spectroscopy
  • Mössbauerite
  • Polytypes
  • Trébeurdenite

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

Mössbauerite, Fe6 3+ O4 (OH) 8 [CO3]·3H2O, the fully oxidized green rust mineral from Mont Saint-Michel Bay, France. / Génin, J. M R; Mills, S. J.; Christy, A. G.; Guérin, O.; Herbillon, A. J.; Kuzmann, E.; Ona-Nguema, G.; Ruby, C.; Upadhyay, C.

In: Mineralogical Magazine, Vol. 78, No. 2, 2014, p. 447-465.

Research output: Contribution to journalArticle

Génin, JMR, Mills, SJ, Christy, AG, Guérin, O, Herbillon, AJ, Kuzmann, E, Ona-Nguema, G, Ruby, C & Upadhyay, C 2014, 'Mössbauerite, Fe6 3+ O4 (OH) 8 [CO3]·3H2O, the fully oxidized green rust mineral from Mont Saint-Michel Bay, France', Mineralogical Magazine, vol. 78, no. 2, pp. 447-465. https://doi.org/10.1180/minmag.2014.078.2.14
Génin, J. M R ; Mills, S. J. ; Christy, A. G. ; Guérin, O. ; Herbillon, A. J. ; Kuzmann, E. ; Ona-Nguema, G. ; Ruby, C. ; Upadhyay, C. / Mössbauerite, Fe6 3+ O4 (OH) 8 [CO3]·3H2O, the fully oxidized green rust mineral from Mont Saint-Michel Bay, France. In: Mineralogical Magazine. 2014 ; Vol. 78, No. 2. pp. 447-465.
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abstract = "The new mineral m{\"o}ssbauerite (IMA2012-049), Fe6 3+ O4 (OH) 8 [CO3]·H 2O, is a member of the foug{\`e}rite group of the hydrotalcite supergroup. Thus, it has a layered double hydroxide-type structure, in which brucite-like layers [Fe6 3+ O4 (OH) 8]2+ are intercalated with CO3 2- anions and water molecules. M{\"o}ssbauerite is the fully oxidized analogue of foug{\`e}rite and tr{\'e}beurdenite, related to them chemically by the exchange of (Fe3+O2-) with (Fe2+OH -). M{\"o}ssbauerite, intimately intergrown with tr{\'e}beurdenite, was discovered in intertidal gleys from Mont Saint-Michel Bay, France, along with quartz, feldspars and clay minerals. M{\"o}ssbauerite is formed by the oxidation of the other members of the foug{\`e}rite group. Like them, it occurs as mm-scale platelets in gleys with restricted access to atmospheric O and decomposes rapidly when exposed to air. Identification and characterization of these minerals has relied on an electrochemical study of synthetic analogues and M{\"o}ssbauer spectroscopy, which inspired the name of the new mineral. Unlike foug{\`e}rite and tr{\'e}beurdenite, which are blue-green, pure synthetic m{\"o}ssbauerite is orange in colour. Detailed optical and other physical properties could not be determined because of the small platelet size and instability. The hardness is probably 2-3, by analogy with other members of the supergroup and the density, calculated from unit-cell parameters, is 2.950 g/cm3. Synchrotron X-ray data indicate that the natural material is a nanoscale intergrowth of 2T and 3T polytypes; the latter probably has the 3T7 stacking sequence. The corresponding maximum possible space group symmetries are P3̄m1 and P3m1. Unit-cell parameters for the 3T cell are a = 3.032(7) {\AA}, c = 22.258(4) = 3×7.420 {\AA} and Z = 1/2. M{\"o}ssbauer spectroscopy at 78 K indicates that two distinct Fe 3+ environments exist in a 2:1 ratio. These are interpreted to be ordered within each layer, but without the development of a threedimensional superlattice. M{\"o}ssbauerite undergoes gradual magnetic ordering at 70-80 K to a ferromagnetic state, below which it splits into three sextets S 1m, S2m and S3m, as measured at 15 K, and shows the same intensity ratio 1/2:1/6:1/3 as the three doublets for foug{\`e}rite D1f, D2f, D3f in the paramagnetic state at 78 K. This suggests that there is also short-range coupling of interlayer carbonate anions with respect to the octahedral layers and that the 2D long-range order of carbonates in interlayers remains unchanged.",
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T1 - Mössbauerite, Fe6 3+ O4 (OH) 8 [CO3]·3H2O, the fully oxidized green rust mineral from Mont Saint-Michel Bay, France

AU - Génin, J. M R

AU - Mills, S. J.

AU - Christy, A. G.

AU - Guérin, O.

AU - Herbillon, A. J.

AU - Kuzmann, E.

AU - Ona-Nguema, G.

AU - Ruby, C.

AU - Upadhyay, C.

PY - 2014

Y1 - 2014

N2 - The new mineral mössbauerite (IMA2012-049), Fe6 3+ O4 (OH) 8 [CO3]·H 2O, is a member of the fougèrite group of the hydrotalcite supergroup. Thus, it has a layered double hydroxide-type structure, in which brucite-like layers [Fe6 3+ O4 (OH) 8]2+ are intercalated with CO3 2- anions and water molecules. Mössbauerite is the fully oxidized analogue of fougèrite and trébeurdenite, related to them chemically by the exchange of (Fe3+O2-) with (Fe2+OH -). Mössbauerite, intimately intergrown with trébeurdenite, was discovered in intertidal gleys from Mont Saint-Michel Bay, France, along with quartz, feldspars and clay minerals. Mössbauerite is formed by the oxidation of the other members of the fougèrite group. Like them, it occurs as mm-scale platelets in gleys with restricted access to atmospheric O and decomposes rapidly when exposed to air. Identification and characterization of these minerals has relied on an electrochemical study of synthetic analogues and Mössbauer spectroscopy, which inspired the name of the new mineral. Unlike fougèrite and trébeurdenite, which are blue-green, pure synthetic mössbauerite is orange in colour. Detailed optical and other physical properties could not be determined because of the small platelet size and instability. The hardness is probably 2-3, by analogy with other members of the supergroup and the density, calculated from unit-cell parameters, is 2.950 g/cm3. Synchrotron X-ray data indicate that the natural material is a nanoscale intergrowth of 2T and 3T polytypes; the latter probably has the 3T7 stacking sequence. The corresponding maximum possible space group symmetries are P3̄m1 and P3m1. Unit-cell parameters for the 3T cell are a = 3.032(7) Å, c = 22.258(4) = 3×7.420 Å and Z = 1/2. Mössbauer spectroscopy at 78 K indicates that two distinct Fe 3+ environments exist in a 2:1 ratio. These are interpreted to be ordered within each layer, but without the development of a threedimensional superlattice. Mössbauerite undergoes gradual magnetic ordering at 70-80 K to a ferromagnetic state, below which it splits into three sextets S 1m, S2m and S3m, as measured at 15 K, and shows the same intensity ratio 1/2:1/6:1/3 as the three doublets for fougèrite D1f, D2f, D3f in the paramagnetic state at 78 K. This suggests that there is also short-range coupling of interlayer carbonate anions with respect to the octahedral layers and that the 2D long-range order of carbonates in interlayers remains unchanged.

AB - The new mineral mössbauerite (IMA2012-049), Fe6 3+ O4 (OH) 8 [CO3]·H 2O, is a member of the fougèrite group of the hydrotalcite supergroup. Thus, it has a layered double hydroxide-type structure, in which brucite-like layers [Fe6 3+ O4 (OH) 8]2+ are intercalated with CO3 2- anions and water molecules. Mössbauerite is the fully oxidized analogue of fougèrite and trébeurdenite, related to them chemically by the exchange of (Fe3+O2-) with (Fe2+OH -). Mössbauerite, intimately intergrown with trébeurdenite, was discovered in intertidal gleys from Mont Saint-Michel Bay, France, along with quartz, feldspars and clay minerals. Mössbauerite is formed by the oxidation of the other members of the fougèrite group. Like them, it occurs as mm-scale platelets in gleys with restricted access to atmospheric O and decomposes rapidly when exposed to air. Identification and characterization of these minerals has relied on an electrochemical study of synthetic analogues and Mössbauer spectroscopy, which inspired the name of the new mineral. Unlike fougèrite and trébeurdenite, which are blue-green, pure synthetic mössbauerite is orange in colour. Detailed optical and other physical properties could not be determined because of the small platelet size and instability. The hardness is probably 2-3, by analogy with other members of the supergroup and the density, calculated from unit-cell parameters, is 2.950 g/cm3. Synchrotron X-ray data indicate that the natural material is a nanoscale intergrowth of 2T and 3T polytypes; the latter probably has the 3T7 stacking sequence. The corresponding maximum possible space group symmetries are P3̄m1 and P3m1. Unit-cell parameters for the 3T cell are a = 3.032(7) Å, c = 22.258(4) = 3×7.420 Å and Z = 1/2. Mössbauer spectroscopy at 78 K indicates that two distinct Fe 3+ environments exist in a 2:1 ratio. These are interpreted to be ordered within each layer, but without the development of a threedimensional superlattice. Mössbauerite undergoes gradual magnetic ordering at 70-80 K to a ferromagnetic state, below which it splits into three sextets S 1m, S2m and S3m, as measured at 15 K, and shows the same intensity ratio 1/2:1/6:1/3 as the three doublets for fougèrite D1f, D2f, D3f in the paramagnetic state at 78 K. This suggests that there is also short-range coupling of interlayer carbonate anions with respect to the octahedral layers and that the 2D long-range order of carbonates in interlayers remains unchanged.

KW - Fougèrite

KW - Gleysols

KW - Hydrotalcite supergroup

KW - Layered double hydroxides

KW - Mössbauer spectroscopy

KW - Mössbauerite

KW - Polytypes

KW - Trébeurdenite

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